wsm STW37 - Page 229

TRANSMISSION
STW34, STW37, STW40, WSM
3-S15
Checking High-pressure Relief Valve
1. Start the engine to warm up the transmission oil until to reach
50 °C (122 °F).
2. Remove the seat under cover and the step.
3. Install adaptor C (Code No.: 07916-50371) (3) and pressure
gauge (49.0 MPa, 500 kgf/cm
2
, 7110 psi) after removing
forward or reverse high-pressure checking port plugs.
4. Depress the brake pedals and set the engine rpm with
1500 min
-1
(rpm).
5. Shift the auxiliary shift lever to "3".
6. Depress the HST pedal to forward or reverse until relief valve
functioning. Then measure the pressure for each one.If the
measurement is not within the factory specification, check the
check and high-pressure relief valve, neutral valve and HST.
NOTE
• High-pressure checking port and high-pressure relief plug
for forward are on the left side of the HST.
Condition
• Engine speed:
1500 min
-1
(rpm)
• Oil temperature:
40 to 60 °C (104 to 140 °F)
9Y1211109TRS0014US0
Checking Charge Relief Valve
1. Start the engine to warm up the transmission oil until to reach
40 °C (104 °F)
2. Remove the plug from the oil filter bracket.
3. Connect the adaptor 58 (2) and pressure gauge.
4. Measure the pressure with speed control pedal to be neutral at
engine 1500 min
-1
(rpm). If the measurement is not within
factory specification, check charge relief valve.
Condition
• Engine speed:
1500 min
-1
(rpm)
• Oil temperature:
40 to 60 °C (104 to 140 °F)
9Y1211109TRS0015US0
High pressure relief
valve pressure
Factory specification
26.4 to 29.4 MPa
270 to 300 kgf/cm
2
3840.2 to 4266.9 psi
(1) Neutral Valve (Forward)
(2) Neutral Valve (Reverse)
(3) Adaptor C
(4) High-pressure Relief Valve
(Reverse)
Charge relief pressure Factory specification
0.4 to 0.8 MPa
4 to 8 kgf/cm
2
56.9 to 113.8 psi
(1) HST Oil Filter Cartridge (2) Adaptor 58
KiSC issued 11, 2014 A