User Manual

E EXCESSIVE HYDRAULIC PUMP NOISE

• Bleed hydraulic system. GO TO Ö

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

• Check for worn or damaged charge pump. See Section 50.

F CONTROL VALVE STICKS OR HARD TO OPERATE

• Check for binding control valve linkage.

• Inspect control valve for broken return spring, contaminated or scored valve bore, or bent valve spool.

See Section 70.

G FREQUENT FAILURE OF HYDRAULIC LINES AND O-RINGS

• Check hydraulic oil for contamination.

• Check hydraulic connections for proper torque.

• Test implement relief valve pressure. See Section 250.

H HYDRAULIC OIL FOAMS

• Check hydraulic lines for kinks or dents.

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

I HYDRAULIC OIL OVERHEATS

• Operator holding control valve open too long causing implement relief valve to open.

• Check oil cooler fins (if equipped) and transmission fins for plugged condition.

• Check for restricted lines or plugged oil filter.

• Test implement relief valve pressure. See Section 250.

• Check for high air temperatures and high draft loads. GO TO ‘

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Diagnosis, Tests and Adjustments/Troubleshooting Guide

TM1590 (17MAY95) 270-20-4 316, 318 & 420 Lawn and Garden Tractors

020895

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