John Deere 318 - Manual (Page 366)

M36682 -UN-25JAN90
A—JT03339 Connector
B—JT03107 Adapter
C—JT03017 Hose
D—JT03344 Gauge, 2000
kPa (300 psi)
IMPORTANT:
Hydraulic control
levers must remain in
neutral position and
engine must be run at
slow idle.
Pressure gauge will
be damaged if a
hydraulic function is
actuated or test is run
at fast idle.
Make test connections
from JT01765 Lawn
and Grounds Care
Products Hydraulic
Fitting Kit.
Run engine at slow
idle.
LOOK: Record pressure
reading.
Charge pressure must
be 620—1240 kPa
(90—180 psi).
CHARGE PRESSURE
OK: Inspect check
valves for wear or
damage. See Section
50. Then repeat
Æ
CHARGE PRESSURE
LOW: REPLACE
FILTER,
THEN...REPEAT
Æ
CHARGE PRESSURE
STILL LOW: GO TO
3a
3a
Charge Pump
Suction Line Check
M49217 -UN-20DEC89
Inspect suction line (A)
for restriction, loose
hose clamp, holes or
damage that would
cause air leakage. SUCTION LINE OK:
GO TO
3b
SUCTION LINE
DAMAGED: Repair or
replace then bleed
hydraulic system. See
Section 270, Group 20.
3b
Charge Relief
Valve Check
M36683 -UN-25JAN90
Remove charge relief
valve and check for a
broken spring or a
stuck or damaged
valve. Replace broken
parts. CHARGE RELIEF
VALVE OR SPRING
WORN: GO TO
3c
CHARGE RELIEF
VALVE NOT
DAMAGED: GO TO
Å
3c
Charge Relief
Valve Adjustment
M36684 -UN-25JAN90
NOTE: Only use shims to increase pressure
when valve or spring are worn. Charge pressure
will not increase by adding shims if another
component is leaking.
Add shims (A) in spring retainer to increase
charge pressure to specification.
Check charge pressure.
IF CHARGE
PRESSURE IS STILL
LOW: GO TO
Å
MX,159025015,13-19-20APR95
MX,159025015,14-19-20APR95
MX,159025015,15-19-20APR95
MX,159025015,16-19-20APR95
Diagnosis, Tests and Adjustments/Charge Relief Valve
TM1590 (17MAY95)
250-15-6
316, 318 & 420 Lawn and Garden Tractors
020895
250
15
6