66 - 2
Powershift Gearbox
Pressure and Flow Testing
Before completing any of the transmission pressure/flow
tests, make sure that the oil level is correct and at normal
operating temperature (not less than 50°C).
All gauges etc used in the following pressure/flow tests are
shown in Service Tools.
!
WARNING
Fine jets of hydraulic oil at high pressure can penetrate
the skin. Do not use your fingers to check for hydraulic
oil leaks. Do not put your face close to suspected leaks.
Hold a piece of cardboard close to suspected leaks and
then inspect the cardboard for signs of hydraulic oil. If
hydraulic oil penetrates your skin, get medical help
immediately.
HYD 1-1
!
WARNING
Take care when disconnecting hydraulic hoses and
fittings as the oil will be HOT.
Trans 1-2
!
WARNING
DO NOT go underneath the machine with the engine
running. Switch off the engine, apply the parking brake
and chock both sides of all wheels before going
underneath the machine.
Trans 2-1
!
WARNING
If a 4 wheel drive machine is to be raised and the
engine/transmission run, make sure all four wheels are
off the ground and supported by axle stands. If only one
pair of wheels is raised, the machine could still drive
through the other axle.
Trans 2-2/2
! WARNING
Under no circumstances must the engine be run with the
transmission in gear and only one driving wheel jacked
clear of the ground, since the wheel on the ground will
move the machine.
INT-3-1-16
TEST POINTS
A - Mainline pressure
B - Converter inlet/converter relief valve pressure
C - Converter outlet pressure
F - Pump flow (remove filter and fit adapters)
J - Lubrication pressure
Clutches:
S - 2/4 wheel drive clutch pressure
T - Forward low ratio clutch pressure
U - Forward high ratio clutch pressure
V - Reverse high ratio clutch pressure
W- Reverse low ratio clutch pressure
X - 6 speed clutch pressure (6 speed gearbox only)
Y - Mainshaft clutch pressure
Z - Layshaft clutch pressure
Other items:
L - Torque converter relief valve
M - Pressure maintenance valve
Test Procedures
Pump Flow
Mainline Pressure
Converter In Pressure
Converter Relief (Safety) Valve Pressure
Converter Out Pressure/Oil Cooler Flow Rate
Lubrication Pressure
Clutches:-
Isolating a Suspect Clutch
Individual Clutch Leakage Test
Section F Transmission
9803/3280
Section F
66 - 2
Issue 1
Service Procedures
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