APRON CYLINDER LEAKAGE TEST
Ensure apron cylinders are blocked prior to retracting disconnected
cylinder rod ends. Cylinders will drop and damage hoses.
Armor plates 1L and 1R must be removed to expose apron
Have suitable container ready to catch oil.
Start engine, lower apron completely, and disconnect right-hand and left-hand end of
cylinder rods (1) from apron (2).
Retract cylinder rods (1) approximately halfway, stop engine, and relieve hydraulic
Disconnect CKT-20 (REAR) TEE hose (3) and CKT-20 (REAR) TEE tube (4) from tee (5)
on hull floor. Cap and plug hose, tube, and fittings.
Start engine, have assistant hold APRON CONTROL lever in UP position. Measure the
extension of both cylinder rods (1). Continue to hold APRON CONTROL lever in UP
position for one minute. Measure the extension of both cylinder rods (1) again. Have
assistant return APRON CONTROL lever to NEUTRAL position. If extension rate is
greater than 1/2 in. (13 mm) per minute, the cylinder is leaking excessively.
Stop engine; relieve hydraulic pressure.
Refer to TM 5-2350-262-20-1.