John Deere 318 - Manual (Page 367)

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IMPLEMENT RELIEF
VALVE PRESSURE
TEST
N
CAUTION: TO
AVOID INJURY FROM
ESCAPING
HYDRAULIC OIL
UNDER PRESSURE,
RELIEVE THE
PRESSURE IN THE
SYSTEM BY
STOPPING THE
ENGINE AND
OPERATING ALL
HYDRAULIC
CONTROL VALVES.
M36682 -UN-25JAN90
A—JT03339 Connector
B—JT03107 Adaptor
C—JT03017 Hose
D—JT03345 Gauge,
20,000 kPa (3000 psi)
Make test connections from
JT01765 Lawn and Grounds Care
Products Hydraulic Fitting Kit.
Heat hydraulic oil to 43˚C (110˚F),
see
Õ
in this group.
Run engine at fast idle.
Move and hold control valve lever in
full raise position.
LOOK: Record pressure reading.
Implement pressure must be
5861—6722 kPa (850—975 psi).
IMPLEMENT
PRESSURE OK: GO
TO
Ö
IMPLEMENT
PRESSURE LOW: GO
TO
4a
4a
Implement Relief
Valve Check
M36686 -UN-25JAN90
Remove implement
relief valve and check
for a broken spring or a
stuck or damaged
valve.
LOOK: Implement relief
valve spring is a much
heavier spring than the
charge relief valve
spring.
IMPLEMENT RELIEF
VALVE NOT
DAMAGED: GO TO
4b
IMPLEMENT RELIEF
VALVE DAMAGED:
Replace damaged valve
parts, then check
implement pressure.
IMPLEMENT
PRESSURE STILL
LOW: GO TO
4b
4b
Implement Relief
Valve Adjustment
M36687 -UN-25JAN90
NOTE: Only use shims to increase pressure
when valve or spring are worn. Implement
pressure will not increase by adding shims if
another component is leaking.
Add shims in spring retainer to increase
implement pressure to specification.
Check implement pressure.
IF IMPLEMENT
PRESSURE IS STILL
LOW: GO TO
Ö
MX,159025015,17-19-21APR95
MX,159025015,18-19-20APR95
MX,159025015,19-19-20APR95
Diagnosis, Tests and Adjustments/Implement Relief Valve
TM1590 (17MAY95)
250-15-7
316, 318 & 420 Lawn and Garden Tractors
020895
250
15
7