Packing drag test

TM 10-3930-634-34

(e) Piston may be operated as necessary for

sure that rod is straight.

wear in.

(4) Inspect mounting hardware for cracks, breaks,

(f) Piston rod will extend with maximum of 15

damage or excessive wear. Replace all defective parts.

psi on the rod side of the piston.

d. Reassembly. Refer to figure 5-14 andreassemble

(2) Piston leakage test.

the steering cylinders. Tighten rod end nut in accord-

(a) Fill the cylinder with oil. Seal the rod and

ance with specifications in paragraph 1-7b(8).

load the head end of the piston to not less than 2000

e. Test.

psi and hold this pressure for 15 minutes. The packing

(1) Packing drag test.

gland should be tightened just tight enough that leak-

(a) With cylinder horizontal, fill rod end of cyl-

age stops.

inder with oil.

(b) Measure and record the travel of the piston

(b) Open head end of the piston to the atmos-

during the 15 minutes.

phere.

(c) With rod end under no load except normal

inder.

seal and wiper drag, pressurize the rod end of the cyl-

inder and record the maximum pressure reached be-

(d) Maximum piston rod drift should not exceed

fore the piston moves.

one inch per hour.

f. Installation. Refer to figure 5-13 and install the

(d) Repeat the above for the head end of the cyl-

steering cylinders.

inder.