12H, 140H, 143H, 160H and 163H Motor Graders Hydraulic and Steering System Piston Pump (Hydraulic and Steering) Caterpillar


Piston Pump (Hydraulic and Steering)
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Illustration 1g01392878

(5) Pump control valve group

The rotation of the shaft is counterclockwise when the rotation of the shaft is viewed from the drive end.

Type of the pump: Variable piston

For the test, use SAE 10W oil that is at 65 °C (149 °F).

Test at full speed:

Output ... 210 ± 10 L/min (55 ± 2.6 US gpm)
Pressure ... 690 kPa (100 psi)
Pump speed ... 2200 rpm
Engine speed ... 2200 rpm
Output ... 200 L/min (53 US gpm)
Pressure ... 6900 kPa (1000 psi)
Pump speed ... 2200 rpm
Engine speed ... 2200 rpm

Test at half speed:

Output ... 105 ± 10 L/min (28 ± 2.6 US gpm)
Pressure ... 690 kPa (100 psi)
Pump speed ... 1100 rpm
Engine speed ... 1100 rpm
Output ... 100 L/min (26 US gpm)
Pressure ... 6900 kPa (1000 psi)
Pump speed ... 1100 rpm
Engine speed ... 1100 rpm

(1) Torque for four bolts ... 91 ± 4 N·m (65 ± 3 lb ft)

(2) Torque for the bolt ... 91 ± 4 N·m (65 ± 3 lb ft)

(3) Torque for the bolt ... 91 ± 4 N·m (65 ± 3 lb ft)

(4) Torque for four bolts ... 34 ± 3 N·m (25 ± 2 lb ft)




Illustration 2g01392310

View D-D

(7) Pump rotating group (steering)

Note: Apply 4C-4030 Thread Lock Compound to the threads of the rods before installation.

(6) Torque for rods ... 79 ± 4 N·m (60 ± 3 lb ft)

(8) 100-3409 Bias Spring

Length under test force ... 115 mm (4.5 inch)
Test force ... 414 ± 41 N (93 ± 9.2 lb)
Free length after test ... 141 mm (5.6 inch)
Outside diameter ... 42 mm (1.7 inch)

Note: To achieve 0.010 to 0.100 mm (0.0004 to 0.0039 inch) axial shaft end play, use shims, as required.

(9) 6E-1436 Shim Pack

Quantity ... 17
Outside diameter ... 38.5 mm (1.52 inch)
Inside diameter ... 32.02 mm (1.261 inch)

(10) Torque for two plugs ... 12.9 ± 0.1 N·m (115 ± 1 lb in)




Illustration 3g01392328

View A-A

(11) Torque for swashplate plug ... 102 ± 4 N·m (75 ± 3 lb ft)

(12) Torque for three bolts ... 8.5 ± 1.0 N·m (75 ± 9 lb in)

(13) Torque for two flat head screws ... 4.0 ± 0.4 N·m (35 ± 4 lb in)

(14) 9T-1699 Spring

Length under test force ... 11.10 mm (0.437 inch)
Test force ... 32.60 ± 3.11 N (7.3 ± 0.7 lb)
Free length after test ... 17.17 mm (0.676 inch)
Outside diameter ... 24.892 mm (0.9800 inch)



Illustration 4g01392353

View B-B

(15) Torque for O-ring plug ... 102 ± 4 N·m (75 ± 3 lb ft)




Illustration 5g01392332

Pump rotating group (steering)

Note: Apply 4C-4030 Thread Lock Compound to the threads of the bolts before installation.

(16) Torque for four socket head bolts ... 34 ± 3 N·m (25 ± 2 lb ft)

(17) 9T-7771 Spring

Length under test force ... 51.5 mm (2.03 inch)
Test force ... 1555 ± 155 N (350 ± 35 lb)
Free length after test ... 71.2 mm (2.80 inch)
Outside diameter ... 52.7 mm (2.07 inch)

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