John Deere 318 - Manual (Page 365)

‘
CHECK VALVE
DEBRIS CHECK
Engine OFF.
Service park brake
OFF.
M49216 -UN-20DEC89
316 and 318; Engage
Manual Push lever (A)
and push machine
forward to remove
debris from check
valves.
Early 420; Remove
fender deck. Remove
and inspect check
valves for debris.
Repair or replace if
necessary.
Later 420; Remove
fender deck. Manually
depress check valve
“buttons” and push
machine forward to
remove debris from
check valves.
Repeat Transmission
Drive Check in Group
05.
Æ
CHARGE PUMP
PRESSURE TEST
Heat hydraulic oil to 43˚C (110˚F), See
Õ
in this
group.
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.
NOTE: It is normal for charge pressure to
increase as engine speed or implement pressure
increases. Charge pressure up to 3448 kPa (500
psi) at fast idle is normal.
Continued on next page
MX,159025015,12-19-21APR95
Diagnosis, Tests and Adjustments/Charge Pump
TM1590 (17MAY95)
250-15-5
316, 318 & 420 Lawn and Garden Tractors
020895
250
15
5