John Deere 318 - Manual (Page 428)

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 ‘
MX,159027020,7 -19-24APR95
MX,159027020,8 -19-24APR95
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Diagnosis, Tests and Adjustments/Troubleshooting Guide
TM1590 (17MAY95)
270-20-4
316, 318 & 420 Lawn and Garden Tractors
020895
270
20
4