HYDRAULIC SYSTEM
STW34, STW37, STW40, WSM
8-S14
[2] DISASSEMBLING AND ASSEMBLING
(1) Hydraulic Pump (Power Steering and 3-Point Hydraulic System)
• The hydraulic pump is precision machined and assembled: if disassembled once, it may be unable to
keep its original performance. Therefore, when the hydraulic pump fails, replacement should be carried
out with the hydraulic pump assembled except when emergency repair is unavoidable.
• When repair is required, follow the disassembly and servicing procedures shown below with utmost care.
• Be sure to test the hydraulic pump with a flowmeter before disassembling.
• After reassembly, be sure to perform break-in operation and ensure that there is nothing abnormal with
the hydraulic pump.
9Y1211109HYS0014US0
Removing Hydraulic Pump Assembly
1. Open the food and remove the side cover (R.H.).
2. Disconnect the accelerator wires (4) from the engine.
3. Remove the joint screw (2) and disconnect the power steering
delivery hose (7).
4. Remove the joint screw (5) and disconnect the bi-speed delivery
pipe.
5. Remove the joint screw (6) and mounting screws (1), and
separate the regulating valve (3) from the hydraulic pump.
(When reassembling)
• Apply grease to the O-ring (10) on the regulator valve (3) and be
careful not to damage it.
• Be sure to install the poppet (13), spring (12) and copper gasket
(8), (9), (11).
(To be continued)
Tightening torque
Joint screw (2)
(Power steering delivery
hose)
49 to 58.8 N·m
5.0 to 6.0 kgf·m
36.2 to 43.4 lbf·ft
Joint screw (5)
(Bi-speed delivery pipe)
34.3 to 39.2 N·m
3.5 to 4.0 kgf·m
25.3 to 28.9 lbf·ft
Joint screw (6)
(Regulator delivery pipe)
39.2 to 49.0 N·m
4.0 to 5.0 kgf·m
28.9 to 36.2 lbf·ft
Regulator valve mounting
screw
17.7 to 20.6 N·m
1.8 to 2.1 kgf·m
13.0 to 15.2 lbf·ft
Delivery hose (7)
installation angle "A"
Factory specification
0.52 rad
30 °
(1) Mounting Screw
(2) Joint Screw (Power Steering
Delivery Hose)
(3) Regulator Valve
(4) Accelerator Wire
(5) Joint Screw
(Bi-speed Delivery Pipe)
(6) Joint Screw
(Regulator Delivery Pipe)
(7) Power Steering Delivery Hose
(8) Copper Gasket
(9) Copper Gasket
(10) O-ring
(11) Copper Gasket
(12) Spring
(13) Poppet
A: Installation Angle of Power
Steering Delivery Hose
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