992G Wheel Loader and 854G Wheel Dozer Power Train Transmission Oil Pump Caterpillar


Transmission Oil Pump
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The pump is a two-section gear type pump.

Rotation is counterclockwise when the pump is viewed from the drive end. Use SAE 10W at a temperature of 49 °C (120 °F) in order to bench test the pump.

Rotate the pump by hand. The pump must rotate freely.




Illustration 1g01367760

Transmission oil pump

(X) Transmission pump

Minimum pump output ... 160 L/min (42 US gpm)
Pump speed ... 1800 rpm
Pump pressure ... 2760 kPa (400 psi)

(Z) Torque converter pump

Minimum pump output ... 110 L/min (29 US gpm)
Pump speed ... 1800 rpm
Pump pressure ... 900 kPa (130 psi)

(1) Torque for the locknut ... 110 ± 13 N·m (80 ± 10 lb ft)

(D) Bore of the new bearing ... 31.786 ± 0.008 mm (1.2514 ± 0.0003 inch)

Diameter of the new shaft ... 31.742 ± 0.005 mm (1.2497 ± 0.0002 inch)




Illustration 2g01367770

View A-A

Use the following procedure to install the sleeve bearings for the oil pump cover.

  1. Install sleeve bearings (2) in the oil pump cover 1.5 ± 0.25 mm (0.06 ± 0.01 inch) below the surface of the oil pump cover.

  1. The distance between bearing joint position (E) and the centerline of the shaft equals 30 ± 15 degrees, as shown.



Illustration 3g01367778

View B-B

Use the following procedure to install the sleeve bearings for the oil pump body.

  1. Install sleeve bearings (3) in the oil pump body 1.50 ± 0.25 mm (0.060 ± 0.010 inch) below the surface of the oil pump body.

  1. The distance between bearing joint position (F) and the centerline of the shaft equals 30 ± 15 degrees, as shown.



Illustration 4g01367782

View C-C

Use the following procedure to install the sleeve bearings for the oil pump manifold.

  1. Install sleeve bearings (4) in the oil pump manifold 1.6 ± 0.5 mm (0.06 ± 0.02 inch) below the surface of the oil pump manifold.

  1. The distance between bearing joint position (G) and the centerline of the shaft equals 30 ± 15 degrees, as shown.

Information System: