Hydraulic Lift Cylinder

TM 10-3930-242-34

(4) Replace defective parts.

solvent P-D-680, or equal.

Dry parts

d. Reassembly. Refer to figure 6-5 and reas-

thoroughly,

s e m b l e the hydraulic tilt cylinder,

(2) Inspect the parts for wear, scored areas,

s c r a t c h e s , nicks, and burrs.

NOTE

( 3 ) Inspect the body of the cylinder for

Upon reassembly, use new packing. Torque the rod

c r a c k s and for distortion.

end nut to 900-1000 ft-lbs torque, as specified in

( 4 ) Replace defective parts.

paragraph 1-7b(8).

d. Reassemble. Refer to figure 6-6 and reas-

e. Test.

(1) Packing Drag Test.

s e m b l e the hydraulic lift cylinder.

(a) With the cylinder horizontal, fill the

NOTE

rod end of the cylinder with oil.

Upon reassembly, use new packing, Torque the rod

(b) Open head end part of the piston to the

end nut to the valve specified in paragraph 1-7b(8).

atmosphere.

e. Test. Refer to paragraph 6-5e and test the

(c) With the rod end under no load except

h y d r a u l i c lift cylinder in a similar manner.

n o r m a l seal and wiper drag, pressurize the rod

f. Installation. Install the hydraulic lift cylin-

end of the cylinder and record the maximum

der (TM 10-3930-242-12).

p r e s s u r e reached before piston moves.

NOTE

(d) Repeat the above for head end of the

The hydraulic lift circuit has a holding and over-

cylinder.

c e n t e r relief valve located inside the right hand

(e) The piston may be operated as neces-

f r a m e . This valve does not require any mainte-

sary for wear in.

nance, service or adjustment. It is pre-set at 3000

(f) Piston rod will extend with maximum

psi.

o f 15 psi on the piston. Piston rod will retract

6-7. Hydraulic Oscillating Cylinder

with maximum of 25 psi on the rod side of the

a. Removal and Installation. Remove and in-

piston.

stall the hydraulic oscillating cylinder (TM

(2) Piston Leakage Test.

10-3930-242-12).

(a) Fill cylinder with oil Seal the rod end

b . Disassembly. Refer to figure 6-7 and disas-

and load the head end of the piston to not less

s e m b l e the hydraulic oscillating cylinder.

than 2000 psi and hold this pressure for 15 mi-

n u t e s . The packing gland should be tightened

NOTE

j u s t tight enough that leakage stops,

The Army model 200 and Army model 222 cylinders

(b) Measure and record the travel of the

a r e of identical construction and have identical

components. The cylinder used on the Army model

piston during the 15 m i n u t e s .

202 has slightly different internal components, but

(c) Repeat the procedure for the rod end

maintenance procedures are similar. The hydraulic

of the cylinder.

oscillating cylinder for the Army model 202 is illus-

(d) M a x i m u m p i s t o n r o d d r i f t m u s t n o t

trated in TM 10-3930-242-34P/2.

exceed one inch per hour.

c. Cleaning and Inspection.

f. Installation. Install the hydraulic tilt cy-

(1) Clean all metal parts thoroughly, using

linder (TM 10-3930-242-12).

solvent P-D-680, or equal. Dry parts

thoroughly.

6-6. Hydraulic Lift Cylinder

(2) Inspect the parts for wear, scored areas,

a. Removal and Intsallation. Remove and in-

s c r a t c h e s , nicks and burrs.

hydraulic

lift cylinder

(TM

stall

the

(3) Inspect the body of the cylinder for

10-3930-242-12).

c r a c k s and distortion.

b . Disassembly. Refer to figure 6-6 and disas-

( 4 ) Replace defective parts.

s e m b l e the hydraulic lift cylinder.

d. Reassembly. Refer to figure 6-7 and reas-

s e m b l e the oscillating cylinder.

NOTE

The Army model 200 and Army model 222 cylinder

a r e of identical construction and have identical

Upon reassembly, use new packing. Torque the rod

components. The cylinder used on the Army model

end nut to the value specified in paragraph 1-7b(8).

202 has slightly different internal components, but

e. Test. R e f e r t o p a r a g r a p h 6 - 5 e and test the

maintenance procedures are similar. The hydraulic

lift cylinder for the Army model 202 is illustrated in

h y d r a u l i c oscillating cylinder in a similar man-

TM 10-3930-242-34P/2.

ner.

f . installation. Install the hydraulic oscillat-

c. Cleaning and Inspection.

ing cylinder (TM 10-3930-242-12).

(1) Clean all metal parts thoroughly, using

6-7