D11R Track-Type Tractor Hydraulic System Caterpillar

Illustration 1	g00344578
145-0772 Cover end

Rotation is counterclockwise when you look from the drive end.

This is a fixed displacement piston pump.

Use SAE 10W oil at 65 deg c (149 deg f) in order to test the pump.

Pump

Output ... 48 L/min (12.5 US gpm)

Pressure ... 6900 kPa (1000 psi)

Speed ... 2200 rpm

(1) Torque for four bolts ... 100 ± 20 N·m (75 ± 15 lb ft)

(2) Torque for plug ... 105 ± 10 N·m (77 ± 7 lb ft)

(3) Torque for two plugs ... 45 ± 5 N·m (33 ± 3.5 lb ft)

(4) 138-4696 Spring

(5) 128-7073 Spring

Illustration 2	g00344904
145-4878 Drive end

Rotation is counterclockwise when you look from the drive end.

This is a variable piston pump.

Use SAE 10W oil at 65 deg c (149 deg f).

Pump

Output ... 156 L/min (41 US gpm)

Pressure ... 6900 kPa (1000 psi)

Speed ... 2200 rpm

Pressure cutoff at zero flow ... 14100 ± 350 kPa (2045 ± 51 psi)

Margin pressure at 2200 rpm, 75 L/min (20 US gpm) and 13600 kPa (19745 psi) discharge pressure ... 2100 ± 100 kPa (305 ± 15 psi)

Standby pressure ... 3150 Maximum

Standby pressure ... 457 Maximum

(6) Torque for four bolts ... 165 ± 30 N·m (120 ± 20 lb ft)

(7) Torque for plug ... 105 ± 10 N·m (77 ± 7 lb ft)

(8) Torque for two plugs ... 45 ± 5 N·m (33 ± 3.5 lb ft)

(9) 6E-6176 Spring

(10) 6E-4009 Spring

Shaft Bearing Preload Adjustment

1. Perform this procedure when you install a new swashplate or bearings.

2. Assemble the pump swashplate, the shaft, the bearing and the shim.

3. Install the cover and tighten four head bolts.27 ± 3 N·m (20 ± 2 lb ft)

4. The clearance must be 0.0 to 0.05 mm (0.0 to .002 inch).

5. If necessary, change the shim in order to achieve the proper initial clearance. Reassemble the head bolts and torque the head bolts. 165 ± 30 N·m (120 ± 20 lb ft)

Compensator Valve

Illustration 3	g01374936

(11) 6E-3274 Spring

Length under test force ... 14.4 mm (.57 inch)

Test force ... 81.7 ± 14.5 N (18.4 ± 3.3 lb)

Free length after test ... 15.9 mm (.63 inch)

Outside diameter ... 7.7 mm (.30 inch)

(12) 6E-3275 Spring

Length under test force ... 15.1 mm (.59 inch)

Test force ... 40.2 ± 2.8 N (9.0 ± .6 lb)

Free length after test ... 20.5 mm (.81 inch)

Outside diameter ... 10.7 mm (.42 inch)

(13) 6E-3276 Spring

Length under test force ... 32.6 mm (1.28 inch)

Test force ... 462 ± 71 N (104 ± 16 lb)

Free length after test ... 35.6 mm (1.40 inch)

Outside diameter ... 19.2 mm (.76 inch)