APRON CYLINDER LEAKAGE TEST
Have suitable container ready to catch oil.
Have assistant start engine, and retract cylinders (1) approximately halfway. Stop engine;
relieve hydraulic pressure.
Disconnect CKT-20 (REAR) TEE hose (2) and CKT-20 (REAR) TEE tube (3) from tee (4)
on hull floor. Plug hose (2) and tube (3), and cap tee (4).
Start engine and have assistant hold APRON CONTROL lever in UP position. Measure
cylinder rod extension of both apron cylinders (1). Continue to hold APRON CONTROL
lever UP for one minute. Have assistant return APRON CONTROL lever to NEUTRAL
position. Measure the cylinder rod extension of both apron cylinders (1) again. If
extension rate is greater than 0.5 in. (13 mm) per minute, cylinder is leaking excessively.
Stop engine; relieve hydraulic pressure.
Refer to TM 5-2320-262-20-1.