wsm STW37 - Bi-Speed Valve

HYDRAULIC SYSTEM
STW34, STW37, STW40, WSM
8-S16
3) Hydraulic Pump Running-in
After reassembly, perform running-in operation in the following
manner, and check the pump for abnormality before use. If the
pump temperature should rise noticeably during running-in, recheck
should be performed.
1. Install the hydraulic pump to the tractor, and mount the suction
pipe and delivery pipe securely.
2. Set the engine speed at 1300 to 1500 min
-1
(rpm), and operate
the hydraulic pump at no load for about 10 minutes.
3. Set the engine speed at 2000 to 2200 min
-1
(rpm), and with the
hydraulic pump applied with 2.94 MPa (30 kgf/cm
2
, 427 psi) to
4.90 MPa (50 kgf/cm
2
, 711 psi) pressure, operate it for approx.
15 minutes.
4. With the engine set to maximum speed, fully turn the steering
wheel to the left or right, then actuate the relief valve five times
for 25 seconds (one time 5 seconds) (for power steering pump.).
5. Stop the engine, then loosen the feedback rod lock nut by 5
turns and screw in the adjusting nut.
6. With the engine set to maximum speed, raise the position
control lever and actuate the relief valve five times for 25
seconds (one time 5 seconds) (for 3P hydraulic pump).
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(2) Bi-speed Valve
Draining Transmission Fluid
• See page 1-S21, 1-S31.
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Removing Bi-speed Valve
1. Disconnect the 4P connector (3) from the bi-speed valve (2).
2. Disconnect the PTO delivery hose (1) and bi-speed delivery
pipe (4) from the bi-speed valve (2).
3. Remove the mounting screws and remove the bi-speed valve
(2).
(When reassembling)
• Apply liquid gasket (Three Bond 1206C or equivalent) to the
bi-speed valve case.
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Bi-speed Valve Assembly
1. The solenoid valve (2), (3) can be removed together with the
connector.
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Tightening torque
PTO delivery hose (1)
retaining nut
15 to 17 N·m
1.5 to 1.75 kgf·m
10.8 to 12.7 lbf·ft
Bi-speed delivery pipe (4)
retaining nut
30 to 49 N·m
3.0 to 5.0 kgf·m
21.7 to 36.2 lbf·ft
Bi-speed valve mounting
screw
23.5 to 27.5 N·m
2.4 to 2.8 kgf·m
17.4 to 20.3 lbf·ft
(1) PTO Delivery Hose
(2) Bi-speed Valve
(3) 4P Connector
(4) Bi-speed Delivery Pipe
(1) Bi-speed Valve
(2) Solenoid Valve
(for Bi-speed Clutch)
(3) Solenoid Valve (for PTO Clutch)
(4) Connector
(5) Joint
KiSC issued 11, 2014 A