992G Wheel Loader and 854G Wheel Dozer Braking System Piston Pump (Brake) Caterpillar

Illustration 1	g00100423
Side view of the brake pump

Illustration 2	g00100424
End view of the brake pump

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

Type of pump ... Load Sensing Variable Displacement Piston Pump

Note: The directional arrow in Illustration 2 indicates the direction of the shaft rotation.

(1) 4T-1916 Spring

Length under test force ... 42.06 mm (1.656 inch)

Test force ... 65.0 ± 6.5 N (14.61 ± 1.46 lb)

Free length after test ... 54.1 mm (2.13 inch)

Outside diameter ... 18.42 mm (.725 inch)

(2) Torque for the four screws ... 23 ± 2 N·m (17 ± 1 lb ft)

(3) Torque for the four bolts ... 38 ± 4 N·m (28 ± 3 lb ft)

Specifications for a Bench Test

For the test, use SAE 10 oil that is at 46 ± 3°C (115 ± 5°F).

Test at full speed:

Output ... 40 L/min (10.6 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 2200 rpm

Engine speed ... 1750 rpm

Output ... 38 L/min (10 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 2200 rpm

Engine speed ... 1750 rpm

Test at half speed:

Output ... 20 L/min (5.3 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 1100 rpm

Engine speed ... 875 rpm

Output ... 19 L/min (5 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 1100 rpm

Engine speed ... 875 rpm

Specifications for a Machine Test

For the test, use SAE 10 oil that is at 46 ± 3°C (115 ± 5°F).

Test at full speed:

Output ... 35 L/min (9.2 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 1883 rpm

Engine speed ... 1750 rpm

Output ... 34 L/min (9 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 1883 rpm

Engine speed ... 1750 rpm

Test at half speed:

Output ... 17.5 L/min (4.6 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 942 rpm

Engine speed ... 875 rpm

Output ... 17 L/min (4.5 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 942 rpm

Engine speed ... 875 rpm

Pressure compensator Valve (Brake)

Illustration 3	g00013108

Pressure setting for the pressure and flow compensator valve ... 16000 ± 345 kPa (2320 ± 50 psi)

(1) 3G-5423 Spring

Length under test force ... 34.11 mm (1.343 inch)

Test force ... 555 ± 58 N (125 ± 13 lb)

Free length after test ... 39.88 mm (1.570 inch)

Outside diameter ... 16.08 mm (.633 inch)

(2) Torque for the nut ... 9 ± 1 N·m (80 ± 9 lb in)

Note: When you tighten nut (2), hold setscrew (3) .