User Manual

B LOW OR SLOW HYDRAULIC POWER

• Check for dented or restricted lines.

• Check for proper engine speed. See Section 220.

• Test charge pump pressure. See Section 250.

• Check for plugged oil filter.

• Check suction line for air leaks. See Section 250.

• Test implement relief valve pressure. See Section 250.

• Test control valve for leakage. GO TO Å

• Inspect cylinder packings for excessive wear. GO TO Æ

C HYDRAULIC SYSTEM OPERATES ERRATICALLY

• Bleed hydraulic system. GO TO Ö

• Check for restricted lines.

• Test charge pump pressure. See Section 250.

• Check for plugged oil filter.

• Check suction line for air leaks. See Section 250.

• Check for dirt in implement relief valve. See Section 50.

D LOAD DROPS WITH CONTROL VALVE IN NEUTRAL POSITION

• Check lines from control valve to rockshaft cylinder for leakage.

• Check control valve for centering when released.

• Check implement relief valve for leakage. See Section 250.

• Test control valve for leakage. GO TO Å

• Check cylinder packings and O-rings for leakage. GO TO Æ

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Diagnosis, Tests and Adjustments/Troubleshooting Guide

TM1590 (17MAY95) 270-20-3 316, 318 & 420 Lawn and Garden Tractors

020895

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