Possible Trouble Causes Remedies

POSSIBLE TROUBLE

POSSIBLE TROUBLE	CAUSES			REMEDIES

1. Motor turns while unloaded	A. Scored back plate.	A.	Remove		backplate			and
but slows down or stops when	B. Scored or worn piston shoes.	examine surface condition of flat
load is applied.	C. Low relief valve pressure.	area;	if		scored,		replace
		backplate. DO NOT LAP.
		B. Disassemble motor,				examine
		condition of shoes on pistons;
		replace pistons as a complete
		set if necessary. DO NOT LAP.
		C. Check relief valve for proper
		pressure		setting adjust				or
		replace relief valve.

2. Motor will not turn.	A. Severely scored backplate.	A.	Disassemble				motor
		completely. Inspect				all	parts,
		clean all parts, replace all worn
		parts and flush hydraulic system.

3. Motor free wheels.	A. Oil-flow and pressure shut off	A. When the hydraulic system is
	going to motor.	shut off, either by shutting off the
		engine on a closed loop system
		or returning the control valve
		spool to neutral on an open
		center system, the motor will
		free-wheel after it has leaked off.
		This is inherent in the design. On
		a closed loop or propulsion
		system,		the	motor	will		not
		free-wheel as long as charge
		pressure is maintained to and
		from the motor.

4. Excessive case drain flow.	A. Excessive internal wear in	A. Disassemble motor,					inspect
	motor.	parts and replace as necessary.
		Case drain flow should not
		exceed 1.5 GPM at full pressure.

Maintenance Section 5-12