John Deere 318 - Manual (Page 368)

Ö
CHARGE PUMP
FLOW 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.
Make front outlet connections from JT01765
Lawn and Grounds Care Products Hydraulic
Fitting Kit and JT05469 Flowmeter Kit.
Heat hydraulic oil to 43˚C (110˚F), See Õ in this
group.
M36688 -UN-25JAN90
A—JT03340 Quick
Coupler
B—JT03343 Connector
C—JT03342 Coupler
D—JT05531 Hose
E—STD12 Flowmeter
Run machine at fast
idle.
Move and hold outside
hydraulic control lever
in implement lower
position. Turn load
valve until pressure
reaches 3450 kPa (500
psi).
LOOK: Pump flow must
be a minimum of 11
L/min (3 gpm)
CHARGE PUMP FLOW
OK: Inspect
transmission internal
components for wear or
damage. See Section
50.
CHARGE PUMP FLOW
NOT OK: Inspect
charge pump for
sheared drive pin, wear
or damage. Repair or
replace, then test
charge pump flow.
Ò
WELCH PLUG
LOCATION CHECK
M49218 -UN-20DEC89
NOTE: If welch plug is missing, unfiltered oil is
flowing through the transmission possibly causing
excessive wear of the rotating groups and charge
pump.
Remove transmission oil filter.
Check for welch plug at position (A). Put a piece
of wire thru threaded fitting. It must hit welch
plug and not come out kidney shaped port.
If welch plug is missing install a new one through
suction hose fitting (B). Use LOCTITE thread
sealant and stake into housing.
MX,159025015,20-19-20APR95
MX,159025015,21-19-20APR95
Diagnosis, Tests and Adjustments/Welch Plug Location Check
TM1590 (17MAY95)
250-15-8
316, 318 & 420 Lawn and Garden Tractors
020895
250
15
8