John Deere 318 - Manual (Page 431)

4b
Models 318 and
420
M36682 -UN-25JAN90
A—JT03339 Connector
B—JT03107 Adapter
C—JT03017 Hose
D—JT03345 Gauge
20,000 kPa (3,000 psi)
Heat hydraulic oil to 43˚C (110˚F).
See
‘
in this group.
Make test port connections from
JT01765 Lawn and Grounds Care
Products Hydraulic Fitting Kit.
Remove control valve return line
from “OUT” port on control valve.
If steering valve return line is
connected into control valve return
line, it must be plugged in order to
isolate only the control valve
leakage.
Put container under control valve to
catch leakage.
Hold a 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.
Repeat test for remaining control
lever(s).
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,159027020,18-19-24APR95
MX,159027020,19-19-03MAY95
Diagnosis, Tests and Adjustments/Control Valve Leakage Test
TM1590 (17MAY95)
270-20-7
316, 318 & 420 Lawn and Garden Tractors
020895
270
20
7