Piston leakage test.

TM 10-3930-634-34

(a) With the cylinder horizontal, fill the rod end

of the cylinder with oil.

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

mosphere.

(c) With the rod end under no load except nor-

mal seal and wiper drag, pressurize the rod end of the

cylinder and record the maximum pressure reached be-

fore piston moves.

(d) Repeat the above procedure for the head end

of the cylinder.

(e) The piston may be operated as necessary for

wear in.

(f) Piston rod will extend with maximum of 15

psi on the piston. Piston rod will retract with maxi-

mum of 25 psi on the rod side of the piston.

(2) Piston leakage test.

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

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

psi and hold this pressure for 15 minutes. The packing

gland should be tightened just enough so that leakage

stops.

(b) Measure and record the travel of the piston

during the 15 minutes.

(c) Repeat the above procedure for the rod end

of the cylinder.

(d) Maximum piston rod drift must not exceed

one inch per hour.

f. Installation. Refer to figure 6-7 and install the

tilt cylinder.