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TESTING AND ADJUSTING
Trouble diagnosis by oil pressure readings
1. If transmission shifts hard:
Complaint
Possible cause
Remedy
No shift to some speeds.
(1) Clutch piston sealing ruptured
Disassemble and replace.
Pressure reading at tap M:~Normal
(2) Control valve gasket ruptured
Disassemble and replace.
Pressure reading at taps D and S:
(3) Absence of 0-ring or broken 0-
°
Disassemble and install 0-ring or
Abnormally low
—
not higher
ring in pipe between transmis-
replace broken one.
than 10 kgf/cm2 (142 psi)
siop~case and clutch case
{l MPa}
(4) Oil hole blanking ball off
•
Fit ball by driving.
No shift to all speeds.
(1) Defective gear pump
Replace.
Pressure reading at taps M, I)
(2) Clogged oil passage between
•
Check and clean clogged part by
and S:
strainer and pump, between
flushing; or repair leaking point.
All low
—
not higher than
pump and line filter or between
10 kgf/cm2(142 psi) [1 MPa]
filter and control valve; or
leakage
~
(3) Main relief valve sticking
Disassemble and clean.
No shift to all gears.
Main orifice restricted
Disassemble and clean.
Pressure reading at tap M: Normal
Pressure reading at taps D and S:
0 kgf/cm2
No shift to some speeds.
Clutch plates burnt or friction-material
Disassemble and replace.
Pressure reading at taps M, D
surfaces lost due to peeling
and S:
If forward clutch plates burnt and
All normal,
seized:
Machine starts on Fl, F2 and F3 but
engine stalls on Ri, R2 and R3.
If 1st~speed clutch plates burnt and
seized:
Machine starts on Fl and Ri but
engine stalls on F2, R2, F3 and R3.
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