Fig 31. Lubrication order.To requisition a replacement Lubrication Order address Office of the Chief, Chemical Warfare Service, Washington 25, D. C.NOT TO BE REPRODUCED in whole or in part without permission of the Office of the Chief, Chemical Warfare Service.NO. 4001————KEY————LUBRICANTSINTERVALSCG-GREASE,1-AFTER EACH MISSIONGENERAL PURPOSE6-AFTER SIX MISSIONSNO. 1 (ABOVE + 32°F)OR MORE OFTENNO. O (BELOW + 32°F)THIS ORDER IS TO BE FASTENED TO INSIDE LID OF FLAME THROWERPACKING CHEST.Copy of this Lubrication Order will remain with the equipment at all times; instructions contained therein are mandatory and supersede all conflicting lubrication Instructions dated prior to5 MAY 1944By order of the Secretary of War:G. C. Marshall, Chief of Staff.Official:J. A. Ulio,Major General,The Adjutant General.
Fig 31. Lubrication order.
To requisition a replacement Lubrication Order address Office of the Chief, Chemical Warfare Service, Washington 25, D. C.
NOT TO BE REPRODUCED in whole or in part without permission of the Office of the Chief, Chemical Warfare Service.
NO. 4001
————KEY————LUBRICANTSINTERVALSCG-GREASE,1-AFTER EACH MISSIONGENERAL PURPOSE6-AFTER SIX MISSIONSNO. 1 (ABOVE + 32°F)OR MORE OFTENNO. O (BELOW + 32°F)THIS ORDER IS TO BE FASTENED TO INSIDE LID OF FLAME THROWERPACKING CHEST.
Copy of this Lubrication Order will remain with the equipment at all times; instructions contained therein are mandatory and supersede all conflicting lubrication Instructions dated prior to5 MAY 1944
By order of the Secretary of War:G. C. Marshall, Chief of Staff.
Official:J. A. Ulio,Major General,The Adjutant General.
a.Gun group. War Department Lubrication Order No. 4001 (Fig 31) shows the parts which require lubrication, the lubricants, and the intervals.
(1)Lubricants. Grease, general purpose, No. 1 is used, except for temperatures below freezing, when grease, general purpose. No. 0 is used. The bearing surfaces should be lightly coated with the grease.
(2)Frequency of lubrication. The surfaces of the ignition-head body which touch the spring case should be lubricated after each use of the weapon. Other parts are lubricated after six firing missions, six training sessions, or oftener. All should be thoroughly cleaned (Pars52,55, and56) with gasoline, dry cleaning solvent, or other solvent, then dried before lubrication. If the gun is disassembled for any other reason, it should be lubricated before reassembly.
(3)Records. To ascertain when six missions have been fired, a record of firing (Par 2) should be kept with each flame thrower.
b.Tank group. The tank group ordinarily requires no lubrication. However, it may under the following exceptional circumstances:
(1) If the tank group has been immersed in water for several hours, the flexible shaft of the pressure valve may have lost its lubricant. If so, remove the shaft (Par 66b) and inspect. If lubricant is not present, as indicated by difficulty of movement after removal, dip the shaft in solvent to clean and then dip in warmed grease, general purpose, No. 1. Replace shaft in valve.
(2) If filling or safety-head plugs (Figs39and40) tend to stick to fuel tanks, apply grease, general purpose, No. 1 (No. 0 if below freezing temperatures) before replacing plugs.
Preventive maintenance services, as prescribed by Army Regulations, are a function of using organization echelons of maintenance. These services consist of:
a. Before, during, and after operation services performed by the firers and assistants.
b. Scheduled services performed by organizational maintenance personnel (service when filling and charging, and service after six firing missions).
The following services are to be performed before filling, charging, and loading the flame thrower with pressure, fuel, and ignition cylinder:
a.Pressure-tank valve. Open and close pressure-tank valve to test for ease of operation.
b.Threaded connections. Check all threaded connections for tightness, using appropriate wrenches.
c.Tank coupling. Examine coupling for cleanliness and ease of movement of lock and cams. (Par 70) Clean if necessary. If washer is broken, replace, using screw driver to pry out.
d.Plugs. Check filling plug and safety-head plug for completeness of parts (Par 69a) and cleanliness of threads and seats. Clean, if necessary, with cloth. If rod or rod and chain have broken off and fallen in tank, turn tank upside down and remove. Remove deflector tube from head (using hand, not wrench). Inspect to see if diaphragm is intact. If diaphragm is ruptured, replace the safety head with an unbroken head. (Par 69 b, c) Reassemble plug, head, and deflector tube in left fuel tank. (Fig 11) Tube should face to rear and at a 45-degree angle to operator’s left shoulder. (Fig 18) Screw in deflector tube by hand; do not use wrench on deflector tube. Tighten lock nut with wrench.
e.Pressure-tank clamp. The clamp should hold the pressure tank tightly in place. If tank is loose, a wooden splint or wedge under the clamp may be used as a temporary expedient.
f.Carrier-frame bolts. Check tightness. Use wrench.
g.Carrier. (Par 71) Examine all canvas, webbing, and cord for signs of mildew, rot, or wear. Replace defective parts. Move flame thrower to dryer storage if mildew occurs.
h.Cord (lashing). Check for tightness. If necessary, make tighter and use secure, slip-proof knots. When the tank group is filled with fuel and adjusted on the firer, its weight should be carried chiefly by the canvas and webbing, not by the metal frame.
i.Shoulder and body straps. Adjust straps to fit firer. (Pars19and71) A loose tank group can cause discomfort or injury when the wearer changes positions while on a mission. Check presence and condition of the two pins and two cotter pins which hold shoulder straps to steel support. Check fasteners.
The following services are to be performed before filling, charging, and loading with pressure, fuel, and ignition cylinder:
a.Hose nipple, tank end. Examine to be sure nipple is clean and not badly nicked. If badly nicked, the nipple may not make a tight seal at the tank coupling. A leak and loss of pressure may result. See Paragraph73dfor repair of the nipple.
b.Fuel hose. Examine surface of hose for cracks or other signs of deterioration. Special attention should be paid to portions adjacent to the gun and tank coupling, which are subjected to severe flexing. If hose is defective, replace. (Par 73b,c) Do not patch.
c.Hose nipple, gun end. Check tightness of threaded connection between hose and fuel-valve body, using hand or very light wrench pressure.
d.Shield. Remove ignition shield. Check cleanliness of threads on shield and on ignition-head body. If not clean, use cloth. When reassembling (Par 18c), shield should turn freely until it locks in correct position.
e. Valve lever and needle.
(1) There should be some play in the valve lever. To test, remove ignition shield. Compress grip safety and valve lever slowly, observing the motion of the valve needle. The valve lever should move approximately 1/16 inch before the needle begins to move.
(2) Valve needle should be seated firmly in the barrel nozzle. After the valve lever is pulled back and released, no play should occur in the needle. For adjustment of needle, see Paragraph75d.
f.Screws. Use screw driver to test tightness of all screws.
g.Spring retainer and plug. Check tightness of spring retainer and plug (Fig 47) by using hand or very light wrench pressure.
h.Ignition head. All exposed surfaces of the shield, nozzle, needle, and other parts of the ignition head, or adjacent to it, should be clean. If not, use cloth.
i.Atomizer hole. With the fuel valve held fully open, insert a fine wire in the atomizer hole of the nozzle to clean the hole. Then use cloth-wrapped splint to remove from the inside of the nozzle any foreign matter pushed through the atomizer hole. If such matter is not removed, it may interfere with the closing of the fuel valve needle at the nozzle. Repeat procedure ine(2)above.
j.Spring case. Spring case should turn freely on ignition head. If it does not, clean any grease or dirt from, surfaces with cloth and relubricate. (Par 49)
k.Trigger. Pull trigger once or twice to find whether it operates easily and whether it returns to position. If not, clean and lubricate trigger. (Par 49) Check condition of trigger spring.
l.Trigger rod. Check position of the trigger rod when trigger is pulled back all the way as when firing. The rod should extend approximately 1/16 inch beyond the end of the lug in the ignition head. If it does not, bend the rod slightly, reverse position of bearing, or replace worn parts.
a.Inspection of fuel tanks. Just before filling and charging, remove plugs (Par 69b) and examine interior of fuel tanks to see whether they are clean and free from foreign matter. If not clean, flush with gasoline until clean.
b.Fuel level. When filling (Pars37through40), see that fuel reaches the same level in both tanks. If leveling does not occur, the tank connector may be clogged with foreign matter. If so, clean, as ina, above. After filling, wipe plug seats with a cloth before replacing plugs. Wipe any spilled fuel from weapon.
c.Pressure-tank valve. Before charging the tank group with air or nitrogen, open and close the pressure-tank valve several times by hand to be sure it operates freely. If it does not, adjust as described in Paragraph66d.
Fig 32. Testing pressure tank and valve, using 0-3,000-pound testing gage from service kit.
Fig 32. Testing pressure tank and valve, using 0-3,000-pound testing gage from service kit.
d.Testing for leaks in pressure system. After charging, and as few hours as possible before a mission, use an 0-3,000-pound gage furnished in service kit to test pressure. (Fig 32) To install gage, unscrew check-valve cap and screw gage in check-valve body. If pressure has fallen below that to which the tank was charged (Par 32), a leak is indicated. Remove gage, replace check-valve cap, and check for leaks at joints between pressure tank and valve and between tank valve and check valve. (A wrench should be used to tighten cap on check-valve body so as to avoid producing an additional leak.) Large leaks can be felt or heard. Small leaks can be detected by coating joints with soap-and-water solution. Bubbles indicate leaks. If a leak is revealed betweenpressure tank and pressure-tank valve, or between check valve and pressure-tank valve, replace all three as a unit. If tests do not show up the leak the tank may have been improperly charged. It should be recharged and then retested.
a.Failure to ignite. Pull trigger repeatedly. If ignition cylinder still fails to ignite, dirt may be wedged in ignition head. Unscrew shield one-half turn. Screw it back, rapping shield with the hand while turning. This should dislodge foreign matter. Pull trigger again. Repeat procedure, if necessary.
b.Safety head “blows” (breaks). If safety head breaks, firing mission cannot be carried out. On return, have head replaced. (Par 69) Follow test procedure. (Par 56b)
a.Unloading. Remove ignition cylinder (Par 30), close pressure-tank valve, and blow out remaining fuel and pressure. (Par 30)
b.Removal of equipment. Release the body straps, then the shoulder straps. If prone, lie on side and allow tank group to roll off onto ground. If standing or kneeling, take care that tank group does not drop on feet or legs.
c.Correcting or reporting. Correct any failures or difficulties or report them as soon as possible to service or maintenance personnel.
d.Gun. Remove shield (Par 18) and clean interior of shield with cloth. Clean holes in shield with wire or wooden splint. Clean external surfaces of barrel, nozzle, needle, and other parts. Check cleanliness and adjustment of needle. (Par 75d) Check trigger for operation. Lubricate. (Par 49)
e.Fuel tanks and passages. Remove plugs (Par 69b). Drain any remaining fuel. Use gasoline to remove residues of thickened fuels before they have a chance to harden and obstruct passages. If necessary, fill tanks with gasoline and allow to stand for several hours, shaking occasionally. Drain and repeat if necessary.
f.Safety head. Check head to see if it is ruptured; if it is, replace. (Par 69) Follow test procedure. (Par 56b)
g.Pressure-tank valve. If weapon is to be stored, open pressure-tank valve and leave it open until next charging.
h.Carrier. Scrub, if necessary, with soap and water, or gasoline.
i.Exterior metal surfaces. Scrub exterior metal surfaces clean of fuel to prevent fire hazard. Allow to dry before using again.
j.General inspection. Carefully examine all other parts, adjust as necessary, and replace any which are damaged.
After the flame thrower has been used on six firing missions or the equivalent in training work, experienced personnel should follow these directions:
a.Before-operation and after-operation service. Follow the same procedures as in Paragraphs 52, 53, and 55.
b.Test firing (or simulated firing).
(1) If tactical conditions permit test firing at a suitable test range (Par 15), fill the fuel tanks with fuel. (Pars37through40)
(2) If test firing with fuel is impracticable, fill fuel tanks with clean water. (Be sure to dry all parts after test.)
(3)Remove filling-plug assembly. (Par 69) Fish out the retainer rod and chain by means of a bent wire.
(4) Do not unscrew the safety-head plug.
(5) Insert the testing plug with 0-to 500-pound pressure gage (plug and gage are from service kit) in the filling-plug opening. Tighten testing plug in seat with wrench.
(6) Fully charge pressure tank. (Par 32)
(7) If test firing with fuel, load ignition cylinder. (Par 18)
(8) Open pressure-tank valve and simultaneously observe pressure in fuel tanks by reading gage. The gage indicates the pressure in both tanks. It should be between 350 and 390 pounds per square inch.
(9) Read the gage at the expiration of not less than 5 minutes. The tanks should have a pressure reading of not more than 390 pounds. If the pressure continues to increase beyond 390 pounds and the safety head blows, replace the safety head and the pressure regulator.
(10) Fire by operating controls (or simulate firing if tanks are filled with water). The burst should last 3 seconds, during which time the pressure should not drop below 260 pounds.
(11) If the pressure does not conform to the requirements stated in (8), (9), and (10), adjust the pressure regulator upward or downward. (Par 67d)
(12) While the above test firing is proceeding, check for leaks at all joints and connections on the tank group. The pressure system should be checked by painting the joints with soap-and-water solution and by looking for bubbles which indicate leaks. For replacement of parts where pressure leaks, see Paragraph 66. Fuel leaks may be seen without soap and water. For repair of fuel leaks, see Paragraph 75e. The nozzle should be observed by removing the ignition shield. Nozzle leaks are corrected by cleaning, adjusting needle (Par 75d), or by regrinding. (Par 75e) If this is not successful, replace both needle and barrel as a unit.
c.Fuel valve. Discharge all pressure from the gun by operating the fuel valve. Carefully remove the valve grip and grip support. (Par 74) Look for signs of leakage at the valve diaphragm.If a leak is present, replace valve-diaphragm assembly. (Pars75band75c)
d.Valve grip. Disassemble the valve grip (Par 74) and lubricate. (Par 49)
e.Carrier. Tighten the carrier cord.
f.Gun interior. If thickened fuel has been fired, disassemble the gun. All parts should be cleaned of accumulations of dried fuel. Lubricate (Par 49) and reassemble. If liquid fuel has been fired, flush gun with clean gasoline. Disassemble only enough to lubricate. Reassemble.
First, remove the ignition cylinder. Then, before disassembling, servicing, or repairing parts which may be under pressure, be sure to release the pressure. Remove fuel, when necessary.
TroubleRemedya. Defective or damaged valve-diaphragm assembly.If leak is observed in valve grip, disassemble. (Par 74) If diaphragm is torn, or damaged in any other way, remove and replace. (Par 75)b. Defective threaded connections on fuel lines.Disconnect, using wrenches. If thread is stripped or badly damaged, replace the threaded part. If threads appear to be sound, clean them and reconnect. If leak is between tank coupling and tank connector or between hose and fuel-valve body, apply anti-seize compound before rescrewing. Tighten joint with wrenches.c. Dirt or foreign matter on seats or threads.Clean parts carefully with cloth before reassembling.d. Leak at nozzle.Adjust needle. (Par 75d) If leak persists, either replace needle and barrel as a unit or use lapping compound on parts. Turn needle in seat until parts make a tight connection when seated. Remove lapping compound and reassemble.e. Worn body of hose.Replace fuel-hose assembly. (Par 73)f. Leak at tank coupling.Remove and replace coupling washer if damaged. (Par 70) If hose nipple, tank end, is damaged, repair nipple (Par 73d) or replace fuel-hose assembly.
If leak is observed in valve grip, disassemble. (Par 74) If diaphragm is torn, or damaged in any other way, remove and replace. (Par 75)
Disconnect, using wrenches. If thread is stripped or badly damaged, replace the threaded part. If threads appear to be sound, clean them and reconnect. If leak is between tank coupling and tank connector or between hose and fuel-valve body, apply anti-seize compound before rescrewing. Tighten joint with wrenches.
Clean parts carefully with cloth before reassembling.
Adjust needle. (Par 75d) If leak persists, either replace needle and barrel as a unit or use lapping compound on parts. Turn needle in seat until parts make a tight connection when seated. Remove lapping compound and reassemble.
Replace fuel-hose assembly. (Par 73)
Remove and replace coupling washer if damaged. (Par 70) If hose nipple, tank end, is damaged, repair nipple (Par 73d) or replace fuel-hose assembly.
TroubleRemedya. Defective safety head.Replace with new safety head. (Par 69b)b. Defective pressure regulator.If replacement safety head also breaks, follow test procedure in Paragraph 56bto determine whether pressure regulator needs adjustment or is defective.
Replace with new safety head. (Par 69b)
If replacement safety head also breaks, follow test procedure in Paragraph 56bto determine whether pressure regulator needs adjustment or is defective.
TroubleRemedya. Cord becomes loose or breaks.Use only hard-braided seine cord furnished in service kit for replacements. Lace tightly as shown inFigure 46, using slip-proof knots at ends.b. Straps not adjusted to fit wearer.Adjust straps to fit each new wearer. Tank group must be high on back and snug on body. (Pars19and71)c. Carrier frame presses on wearer’s back.Cord is too loose. Tighten cord. Use slip-proof knots at ends.
Use only hard-braided seine cord furnished in service kit for replacements. Lace tightly as shown inFigure 46, using slip-proof knots at ends.
Adjust straps to fit each new wearer. Tank group must be high on back and snug on body. (Pars19and71)
Cord is too loose. Tighten cord. Use slip-proof knots at ends.
TroubleRemedya. Stream of burning fuel issues at an angle or in a very broad spray.Fuel valve is not fully open because of:(1) Faulty operation. Be sure to compress controls all the way when firing. (Par 26)(2) Improper adjustment or assembly of valve. To correct, see Paragraphs74and75.b. Rapid drop of range during a burst.Pressure-tank valve is not fully open. Open all the way. If this is not effective, test pressure regulator. (Par 67d)c. Shorter range in each successive burst.Pressure tank is not fully charged.(1) Before firing be sure tank is charged to at least 1,700 poundsper square inch. (Par 32)(2) Check for leaks to make sure pressure has not decreased since charging. (Par 53d)d. Short range with longer time of discharge than 8 to 9 seconds.Dried fuel or other foreign matter is in fuel lines. Disassemble and clean.
Fuel valve is not fully open because of:
(1) Faulty operation. Be sure to compress controls all the way when firing. (Par 26)
(2) Improper adjustment or assembly of valve. To correct, see Paragraphs74and75.
Pressure-tank valve is not fully open. Open all the way. If this is not effective, test pressure regulator. (Par 67d)
Pressure tank is not fully charged.
(1) Before firing be sure tank is charged to at least 1,700 poundsper square inch. (Par 32)
(2) Check for leaks to make sure pressure has not decreased since charging. (Par 53d)
Dried fuel or other foreign matter is in fuel lines. Disassemble and clean.
TroubleRemedyValve fails to close when controls are released.(1) Work the grip safety to trip the valve lever.(2) Foreign matter may be in barrel, or barrel may be dented. If dented, replace barrel and needle as a unit. If not dented, disassemble and clean. (Pars74and75)
(1) Work the grip safety to trip the valve lever.
(2) Foreign matter may be in barrel, or barrel may be dented. If dented, replace barrel and needle as a unit. If not dented, disassemble and clean. (Pars74and75)
TroubleRemedya. Match in cylinder moves but incendiary charge does not ignite.Pull trigger repeatedly. If cylinder does not ignite, remove cylinder (Par 30) and examine.(1) If matches have been pushed flush with inner surface of cylinder body, the cylinder is defective. Destroy. (Par 30) Replace.(2) If matches project 1/16 inch or more from cylinder, ignition head is defective. Disassemble ignition head (Par 76b) and examine. Replace parts as necessary. (Par 76c)b. Cylinder does not rotate to bring new charge into position.(1) Spring case is not free to rotate because of dirt. Clean and lubricate. (Par 49)(2) Cylinder is improperly loaded. (Par 18)(3) Ignition cylinder binds on barrel because of dirt or excessive warping of ignition cylinders from heat of firing. Remove and destroy (Par 30) ignition cylinder. Reload.(4) Spring case is defective. Replace as a unit. (Par 76b,c)c. Trigger does not return to normal position (with ignition cylinder in place).1) When on a mission, use fingers on trigger to pull back to normal position.(2) If time permits, remove trigger rod. (Par 76b) Clean rod and hole in which rod slides. Lubricate. (Par 49) Reassemble. (Par 76c)d. Lack of spring tension at trigger.Trigger spring is off hook of trigger, off spring screw, or broken. Replace where necessary.
Pull trigger repeatedly. If cylinder does not ignite, remove cylinder (Par 30) and examine.
(1) If matches have been pushed flush with inner surface of cylinder body, the cylinder is defective. Destroy. (Par 30) Replace.
(2) If matches project 1/16 inch or more from cylinder, ignition head is defective. Disassemble ignition head (Par 76b) and examine. Replace parts as necessary. (Par 76c)
(1) Spring case is not free to rotate because of dirt. Clean and lubricate. (Par 49)
(2) Cylinder is improperly loaded. (Par 18)
(3) Ignition cylinder binds on barrel because of dirt or excessive warping of ignition cylinders from heat of firing. Remove and destroy (Par 30) ignition cylinder. Reload.
(4) Spring case is defective. Replace as a unit. (Par 76b,c)
1) When on a mission, use fingers on trigger to pull back to normal position.
(2) If time permits, remove trigger rod. (Par 76b) Clean rod and hole in which rod slides. Lubricate. (Par 49) Reassemble. (Par 76c)
Trigger spring is off hook of trigger, off spring screw, or broken. Replace where necessary.
TroubleRemedya. Atomizer hole clogged.Clean with fine wire. (Par 52i)b. Fuel troubles at low temperature.(1) At temperatures below minus 20 degrees Fahrenheit, ignition of any standard fuel is uncertain. Operation at these temperatures should be avoided unless tests of fuels by firing with flame throwers are first made.(2) At temperatures above minus 20 degrees Fahrenheit, no difficulty should be experienced with thickened gasoline. When blended fuels are used, the ratio of gasoline content should be increased as temperature decreases.c. Failure of ignition cylinder.See Paragraph63.
Clean with fine wire. (Par 52i)
(1) At temperatures below minus 20 degrees Fahrenheit, ignition of any standard fuel is uncertain. Operation at these temperatures should be avoided unless tests of fuels by firing with flame throwers are first made.
(2) At temperatures above minus 20 degrees Fahrenheit, no difficulty should be experienced with thickened gasoline. When blended fuels are used, the ratio of gasoline content should be increased as temperature decreases.
See Paragraph63.
The tank group stores fuel and pressure. The fuel is placed under pressure when the pressure-tank valve is opened. The tank group is supported upon the firer’s back and shoulders by the carrier.
a.Description and functioning. The pressure tank and valve assembly (Fig 33) includes:
(1)Pressure tank. The pressure tank is a lightweight, airplane-type cylinder, able to withstand the great pressure which it contains. The tank is charged with air or nitrogen at 1,700 to 2,100 pounds per square inch pressure by use of auxiliary equipment as described in Paragraphs31and32. This pressure stays in the pressure tank until the weapon is ready to be fired. Opening of the pressure-tank valve releases air or nitrogen through the pressure regulator to the fuel tanks. Oxygen or combustible gases are never used in the tank because a violent explosion may result. The tank is large in capacity to assure ample pressure, and hence full range, for the entire load of fuel. The pressure-tank clamp (Fig 39), a steel-strap device with hinge and toggle-type latch, holds the pressure tank in place on the fuel tanks.
(2)Pressure-tank valve. (Figs33and34) This valve is screwed into the bottom of the pressure tank. The valve stem slides into the valve end of the valve flexible shaft. When opened by means of the valve handle and valve flexible shaft, the valve permits passage of compressed air or nitrogen through tubes and the pressure regulator to the fuel tanks. The valve is of the quick-opening, packless, diaphragm type.
(3)Pressure-valve handle and valve flexible shaft. (Figs33and34) The pressure-valve handle is held by a small nut on the end of the valve flexible shaft, which in turn is connected to the pressure-tank valve by means of the valve stem and a large hex nut. The handle and shaft extend to the right of the tank group, enabling the firer to open and close the valve without assistance when carrying the weapon. The handle slips over the end of the shaft and is held to it by a nut. The shaft is held to one of the fuel tanks by a clamp, nut, and bolt welded to the tank.
(4)Check valve. (Figs33through35) The check valve has the same function as the valve on a vehicular tire tube, but it is much heavier in construction and different in design because the pressure in the flame thrower is 50 times greater than that in an automobile tire tube. Connected by threads to the pressure valve, the check valve permits compressed air or nitrogen to enter the pressure tank during charging (Pars31and32) but prevents its escape when the outside source of pressure is removed. The cap is removed from the check valve only for charging or testing.
b.Removal. (Fig 33) To prevent damage to threads, leaks, and loss of pressure and range, remove pressure tank and valve assembly only when necessary.