525C, 535C and 545C Wheel Skidders Hydraulic and Steering System Caterpillar

6E-6012 Piston Pump

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

The pump is a load sensing variable displacement piston pump.

For the test, use SAE 10W oil that is at 65°C (150°F).

Test at full speed:

Output ... 175 L/min (46 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 2400 rpm

Engine speed ... 2200 rpm

Output ... 166 L/min (44 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 2400 rpm

Engine speed ... 2200 rpm

Test at half speed:

Output ... 88 L/min (24 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 1200 rpm

Engine speed ... 1100 rpm

Output ... 83 L/min (22 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 1200 rpm

Engine speed ... 1100 rpm

161-5715 Piston Pump

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

The pump is a load sensing variable displacement piston pump.

For the test, use SAE 10W oil that is at 65°C (150°F).

Test at full speed:

Output ... 194 L/min (51 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 2400 rpm

Engine speed ... 2200 rpm

Output ... 190 L/min (50 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 2400 rpm

Engine speed ... 2200 rpm

Test at half speed:

Output ... 96 L/min (25.5 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 1200 rpm

Engine speed ... 1100 rpm

Output ... 95 L/min (25 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 1200 rpm

Engine speed ... 1100 rpm

Illustration 1	g00611060

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

(2) Torque for the three bolts ... 8.5 ± 1 N·m (75 ± 9 lb in)

(3) Torque for the two screws ... 4 ± 0.4 N·m (35 ± 3 lb in)

(4) 9T-1699 Spring (Large Piston)

Length under test force ... 11.1 mm (.44 inch)

Test force ... 32.6 ± 3.11 N (7 ± 1 lb)

Free length after test ... 17.17 mm (.676 inch)

Outside diameter ... 24.89 mm (.980 inch)

Illustration 2	g00611075

(5) Torque for the plug ... 79 ± 4 N·m (58 ± 3 lb ft)

Illustration 3	g00611086

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

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

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

Illustration 4	g00611106

(9) Apply 9S-3263 Thread Lock Compound to the threads. Torque the rod. ... 79 ± 4 N·m (58 ± 3 lb ft)

(10) 6E-6600 Spring (Small Piston)

Length under test force ... 85.4 mm (3.36 inch)

Test force ... 178 ± 18 N (40 ± 4 lb)

Free length after test ... 91.7 mm (3.61 inch)

Outside diameter ... 40 mm (1.57 inch)

(11) Install the shims. Use shims to attain axial shaft end play of 0.01 to 0.10 mm (.0004 to .004 inch).

Note: The 9T-2197 Shaft Shim Kit consists of 17 shims of various thicknesses. For all of the shims, the outside diameter is 38.5 ± 0.25 mm (1.515 ± .0098 inch). The inside diameter is 28.875 ± 0.125 mm (1.1368 ± .0049 inch).

(12) Apply 9S-3263 Thread Lock Compound to the threads. Torque the rod. ... 79 ± 4 N·m (58 ± 3 lb ft)

(13) Torque for the two plugs ... 12.85 ± 0.15 N·m (114 ± 1 lb in)

Pump Control Valve

Illustration 5	g00528017

Illustration 6	g00886477

Illustration 7	g00528040

Pressure compensation (cutoff pressure) ... 21000 ± 500 kPa (3050 ± 70 psi)

Margin pressure setting ... 2000 ± 150 kPa (290 ± 20 psi)

(1) Torque for needle valve ... 13 ± 0.5 N·m (115 ± 4 lb in)

(2) Turning the adjustment screw clockwise increases margin pressure. Turning the adjustment screw counterclockwise decreases margin pressure.

Change in margin pressure for one turn of adjusting screw (2) ... 1400 kPa (205 psi)

(3) Torque for locknut ... 17 ± 3 N·m (13 ± 2 lb ft)

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

(5) 6E-4246 Spring

Free length ... 38.1 mm (1.50 inch)

Outside diameter ... 14.5 mm (.57 inch)

Wire diameter ... 2.7 mm (.11 inch)

(6) Torque for plug ... 30.5 ± 1.5 N·m (23 ± 1 lb ft)

(7) Torque for two plugs ... 30.5 ± 1.5 N·m (23 ± 1 lb ft)

(8) Turning the adjustment screw clockwise increases cutoff pressure. Turning the adjustment screw counterclockwise decreases cutoff pressure.

Change in cutoff pressure for one turn of adjusting screw (8) ... 2800 kPa (405 psi)

(9) Torque for locknut ... 17 ± 3 N·m (13 ± 2 lb ft)

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

(11) 6E-4228 Spring

Outside diameter ... 24.5 mm (.97 inch)

Free length ... 57.1 mm (2.3 inch)

Test force ... 871 ± 1 N (195 ± .25 lb)

Length under test force ... 45 mm (1.8 inch)