John Deere 318 - Manual (Page 430)

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CONTROL VALVE
LEAKAGE 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.
IMPORTANT: To avoid putting full pump flow
into container, DO NOT return control valve
lever to “neutral” or “float” (if equipped)
position with engine running. If equipped with
power steering, DO NOT move steering wheel.
4a
Model 316
M43632 -UN-12JAN90
A—JT05484 Cap
B—JT03002 Adapter
C—JT03036 Connector
D—JT03339 Connector
E—JT03107 Adapter
F—JT03017 Hose
G—JT03345 Gauge
20,000 kPa (3,000
psi)(Not Shown)
H—Return Line
Heat hydraulic oil to 43˚C (110˚F). See
‘
in this
group.
Disconnect hydraulic hose (return line) (H). Put
disconnected hose into a container.
Make test port connections from JT01765 Lawn
and Grounds Care Products Hydraulic Fitting Kit.
Hold control valve lever in “raise” position.
Start engine and run at fast idle for one minute.
Stop engine. Record amount of oil in container.
Amount must be less than 15 mL/min (1/2 fl
oz/min). Pressure must be 5860—6550 kPa
(850—950 psi).
Repeat test for “lower” position.
IF PRESSURE IS NOT
WITHIN
SPECIFICATIONS: GO
TO SECTION 250 AND
TEST IMPLEMENT
RELIEF PRESSURE.
IF LEAKAGE IS MORE
THAN
SPECIFICATION:
REPLACE CONTROL
VALVE.
MX,159027020,15-19-03MAY95
MX,159027020,16-19-24APR95
MX,159027020,17-19-24APR95
Diagnosis, Tests and Adjustments/Control Valve Leakage Test
TM1590 (17MAY95)
270-20-6
316, 318 & 420 Lawn and Garden Tractors
020895
270
20
6