120H Motor Grader Hydraulic and Steering System Piston Pump (Hydraulic and Steering) Caterpillar


Piston Pump (Hydraulic and Steering)
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120H Motor Grader Hydraulic and Steering System [SENR9123]
HYDRAULIC SYSTEM
PUMP GP
120H Motor Grader Hydraulic and Steering System Piston Pump (Hydraulic and Steering)
143H and 163H Motor Graders Hydraulic and Steering System Pump Control Valve (Pressure and Flow Compensator)



Illustration 1g01393819

(4) 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 ... 158 ± 8 L/min (42.0 ± 2.1 US gpm)
Pressure ... 690 kPa (100 psi)
Pump speed ... 2200 rpm
Engine speed ... 2200 rpm
Output ... 150 L/min (40 US gpm)
Pressure ... 6900 kPa (1000 psi)
Pump speed ... 2200 rpm
Engine speed ... 2200 rpm

Test at half speed:

Output ... 79 L/min (21 US gpm)
Pressure ... 690 kPa (100 psi)
Pump speed ... 1100 rpm
Engine speed ... 1100 rpm
Output ... 75 L/min (20 US gpm)
Pressure ... 6900 kPa (1000 psi)
Pump speed ... 1100 rpm
Engine speed ... 1100 rpm

(1) Torque for two bolts ... 70 ± 7 N·m (50 ± 5 lb ft)

(2) Torque for four bolts ... 70 ± 7 N·m (50 ± 5 lb ft)

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




Illustration 2g01391877

View D-D

(7) Pump rotating group (hydraulic oil cooling)

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

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

(6) 6E-6600 Bias Spring

Length under test force ... 85.4 mm (3.36 inch)
Test force ... 178 ± 18 N (40 ± 4.0 lb)
Free length after test ... 92 mm (3.6 inch)
Outside diameter ... 40 mm (1.6 inch)

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

(8) 9T-2197 Shim Pack

Quantity ... 17
Outside diameter ... 38.5 mm (1.52 inch)
Inside diameter ... 28.88 mm (1.137 inch)

(9) Torque for two plugs ... 12.85 ± 0.15 N·m (115 ± 1 lb in)




Illustration 3g01391161

View A-A

(10) Torque for the swashplate plug ... 101.5 ± 4.5 N·m (75 ± 3 lb ft)

(11) 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)

(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)




Illustration 4g01393820

View B-B

(14) Torque for O-ring plug ... 79 ± 4 N·m (60 ± 3 lb ft)




Illustration 5g01393823

Pump rotating group (hydraulic oil cooling)

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

(15) Torque for four bolts ... 14 ± 1 N·m (125 ± 9 lb in)

(16) 9T-7755 Spring

Length under test force ... 46.0 mm (1.81 inch)
Test force ... 1024 ± 102 N (230 ± 23 lb)
Free length after test ... 75.2 mm (2.96 inch)
Outside diameter ... 47.5 mm (1.87 inch)

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