Triumph TR6 PI Operation Manual page 282

OVERDRIVE-J TYPE
FAULT DIAGNOSIS AND RECTIFICATION
Fault
OVERDRIVE
DOES NOT
ENGAGE
a.
b.
c.
d.
e.
f
Possible Cause
Insufficient oil in unit.
Solenoid not energising.
Solenoid energising but not operating.
Insufficient hydraulic pressure
Pump damaged.
Internal damage.
Remedy
Top up gearbox/overdrive.
Check electrical cir(;uit.
Remove solenoid and check
operation of solenoid valve.
Fit pressure gauge and check
operating pressure.
Clean filters.
Reseat pump non-return valve
if necessary.
Check relief valve operation.
Clean control orifice DO NOT
PROBE WITH WIRE.
Remove and check.
Remove and examine overdrive.
THIS CALLS FOR IMMEDIATE. ATTENTION. DO NOT REVERSE THE CAR, OR
EXTENSIVE DAMAGE MAYBE CAUSED.
a.
Fault in electrical control circuit. Check electrical system for
closed circuit.
b. Sticking solenoid valve. Remove solenoid and check valve.
c. Residual pressure too high. Fit pressure gauge and check
*OVERDRIVE residual pressure. If pressure is
DOES NOT too high check for sticking relief
RELEASE valve.
d. Control orifice blocked. Check and blow through with
compressed air. DO NOT PROBE
WITH WIRE.
e.
Cone clutch sticking.
Tap the brake ring several times
with a hide mallet.
f Internal damage. Remove and examine overdrive.
a.
Insufficient oil in unit. Top up gearbox/overdrive.
b.
Operating pressure too low.
Fit the pressure gauge and check
the pressure. Check the filters,
CLUTCH pump non·return ball valve and
SLIP IN
relief valve.
OVERDRIVE Check the control orifice is clear.
c. Sticking solenoid valve.
Remove solenoid and check
operation of solenoid valve.
d.
Worn or glazed clutch linings.
Remove overdrive and examine
the linings or mechanical
obstruction to movem.ent of
cone clutch.
(THESE SYMPTOMS MAY OCCUR TOGETHER OR SEPARATELY)
SLOW DIS·
a.
ENGAGEMENT OF b.
OVERDRIVE FREE· c.
WHEELING ON
OVER·RUN SLIP d.
IN REVERSE GEAR
Sticking relief valve.
Sticking or partially blocked control valve
Control oritice bloCKea.
Internal damage.
Check for sticking relief valve.
Remove solenoid and check.
Check to ensure the orifice is
clear.
Remove and examine overdrive.
40.00.l1J
Triult).ph Spitfire I Triumph TR6 Manual. Part No. 545277 Issue I