wsm B2420 - Preparation; Hydraulic Pump for Power Steering

STEERING
B2420, WSM
7-S8
Pump Test
NOTE
• Before pump testing, perform the flowmeter connecting
and test preparation.
1. Open the loading valve completely.
2. Start the engine and set at approx. 2600 min
-1
(rpm).
3. Read and note the pump delivery at no pressure.
(Reference)
Condition
• Engine speed
Approx. 2600 min
-1
(rpm)
• Rated pressure
11.8 MPa (120 kgf/cm
2
, 1710 psi)
• Oil temperature
50 °C (122 °F)
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[2] PREPARATION
(1) Hydraulic Pump for Power Steering
IMPORTANT
• The hydraulic pump is precision machined and assembled: If disassemble once, it may be unable to
maintain 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.
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Removing Hydraulic Pump
1. Open the bonnet (1) then remove the front grille (2), side cover
(R.H.) (3) and disconnect the battery negative cable.
2. Disconnect the accelerator rod (8).
3. Disconnect the power steering delivery pipe (4) and 3-point
hitch delivery pipe (5).
4. Disconnect the suction hose (7) and remove the hydraulic pump
(6).
(When reassembling)
NOTE
• For fastening hydraulic pipe nut, use two wrenches. Hold
the fitting with a wrench, turn the pipe nut another wrench
to avoid damage at fitting installed part.
• When disconnecting battery cables, disconnect the
negative cable first. When connecting, positive cable first.
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Hydraulic pump delivery
at no pressure
Factory specification
Above
9.8 L/min.
2.6 U.S.gals/min.
2.2 lmp.gals/min.
Tightening torque
Power steering delivery
pipe nut
65 to 75 N·m
6.7 to 7.6 kgf·m
48 to 55 lbf·ft
(1) Bonnet
(2) Front Grille
(3) Side Cover (R.H.)
(4) Power Steering Delivery Pipe
(5) 3-Point Hitch Delivery Pipe
(6) Hydraulic Pump
(7) Suction Hose
(8) Accelerator Rod
KiSC issued 06, 2012 A