John Deere 318 - Manual (Page 369)

Õ
HYDRAULIC OIL
WARM-UP
PROCEDURE
M43008 -UN-18JAN90
Remove belly
screen/pan.
Install JDG282
Temperature Gauge (A)
on transmission oil
filter.
Apply park brake.
Start engine and run at
full throttle.
M43629 -UN-12JAN90
Move and hold control
lever in implement
“raise” position.
Periodically cycle all
hydraulic functions to
distribute heated oil.
NOTE: 316 Shown
Heat oil to temperature
specified in test.
NOTE: The hydrostatic
transmission should not
exceed 93˚C (200˚F) as
a continuous operating
temperature.
Ú
STEERING VALVE
NEUTRAL CHECK
(318 and 420)
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—JT0339 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 slow idle.
Move steering wheel to left and right turn
position.
LOOK: When steering wheel is being turned
pressure should increase. When steering wheel
is stopped (neutral position) pressure must drop
to approximately 620—1240 kPa (90—180 psi).
Repeat several times to ensure neutral position.
OK: STEERING VALVE
RETURNS TO
NEUTRAL.
STEERING VALVE
DOES NOT RETURN
TO NEUTRAL: Remove
and repair steering
valve. See Section 60.
MX,159025020,22-19-20APR95
MX,159025020,23-19-20APR95
MX,159025020,24-19-20APR95
Diagnosis, Tests and Adjustments/Steering Valve Neutral Check (318 and 420)
TM1590 (17MAY95)
250-15-9
316, 318 & 420 Lawn and Garden Tractors
020895
250
15
9