John Deere 318 - Manual (Page 426)

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TROUBLESHOOTING GUIDE
If hydraulic system does not operate properly, select the appropriate symptom from the list below.
After selecting the appropriate symptom, go to that step and perform the following checks, tests, or
adjustments in the order shown to isolate and repair malfunction.
• HYDRAULIC SYSTEM INOPERATIVE: GO TO A
• LOW OR SLOW HYDRAULIC POWER: GO TO B
• HYDRAULIC SYSTEM OPERATES ERRATICALLY: GO TO C
• LOAD DROPS WITH CONTROL VALVE IN NEUTRAL POSITION: GO TO D
• LOAD DROPS SLIGHTLY WHEN CONTROL VALVE IS SHIFTED TO RAISE POSITION: Check for
damaged lift check in control valve. See Section 70.
• EXCESSIVE HYDRAULIC PUMP NOISE: GO TO E
• CONTROL VALVE STICKS OR HARD TO OPERATE: GO TO F
• FREQUENT FAILURE OF HYDRAULIC LINES AND O-RINGS: GO TO G
• HYDRAULIC OIL FOAMS: GO TO H
• HYDRAULIC OIL OVERHEATS: GO TO I
• 318 AND 420; ATTACHMENT OR HYDRAULIC LEVER DOES NOT STAY IN FLOAT POSITION: Inspect
control valve detent assembly for wear or damage. See Section 70.
A
HYDRAULIC SYSTEM INOPERATIVE
• Check for slipping or broken transmission drive shaft. See Section 50.
• Check for proper charge pump housing installation. See Section 50.
• Check hoses for proper attaching location.
• Check for dented or restricted lines.
• Test charge pump pressure. See Section 250.
• Check suction line for air leaks. See Section 250.
• Check for plugged oil filter.
• Test implement relief valve pressure. See Section 250.
• 318 and 420; Check for steering valve check ball missing, damaged, or in “IN” port. See Section 60.
MX,159027020,2 -19-24APR95
MX,159027020,3 -19-24APR95
Diagnosis, Tests and Adjustments/Troubleshooting Guide
TM1590 (17MAY95)
270-20-2
316, 318 & 420 Lawn and Garden Tractors
020895
270
20
2