IT28G Integrated Toolcarrier and 928G Wheel Loader Hydraulic System Caterpillar

Illustration 1	g00896875

(1) Port to the head end of the lift cylinder

(2) Port to the tank

(3) Port to the rod end of the lift cylinder

(4) Port for the pilot oil for the LOWER position and the FLOAT position

(5) Port for the pilot oil for the TILT BACK position

(6) 122-3595 Relief Valve

Torque for the O-ring face seal nut ... 50 ± 7 N·m (37.0 ± 5.0 lb ft)

Setting for the relief valve ... 22100 ± 300 kPa (3200.0 ± 44.0 psi)

Temperature of the hydraulic oil at test ... 49° ± 3°C (120.0° ± 5.0°F)

Torque for the relief valve ... 70 ± 10 N·m (52.0 ± 7.0 lb ft)

(7) Port to the rod end of the tilt cylinder

(8) Auxiliary port to the tank

(9) Port from the hydraulic pump

(10) Port to the head end of the tilt cylinder

(11) Port for the pilot oil for the DUMP position

(12) Port for the pilot oil for the RAISE position

Illustration 2	g00896879

(13) Makeup valve for the rod end of the lift circuit

Illustration 3	g00896883

(14) 6E-5439 Spring

Assembled length ... 35 mm (1.4 inch)

Load at the assembled length ... 68 ± 4 N (15.0 ± 1.0 lb)

Operating length ... 26 mm (1.0 inch)

Load at the operating length ... 104 ± 6 N (23.0 ± 1.0 lb)

Free length after test ... 52 mm (2.0 inch)

Diameter of the spring ... 14.78 mm (0.582 inch)

(15) 6E-5440 Spring

Assembled length ... 37 mm (1.5 inch)

Load at the assembled length ... 217 ± 17 N (49.0 ± 4.0 lb)

Operating length ... 34.50 mm (1.358 inch)

Load at the operating length ... 353 ± 28 N (79.0 ± 6.0 lb)

Free length after test ... 41 mm (1.6 inch)

Diameter of the spring ... 23.86 mm (0.939 inch)

(16) 6E-5438 Spring

Assembled length ... 34 mm (1.3 inch)

Load at the assembled length ... 300 ± 24 N (67.0 ± 5.0 lb)

Operating length ... 29.05 mm (1.144 inch)

Load at the operating length ... 512 ± 40 N (115.0 ± 9.0 lb)

Free length after test ... 41 mm (1.6 inch)

Diameter of the spring ... 23.86 mm (0.939 inch)

(17) 6E-5437 Spring

Assembled length ... 35 mm (1.4 inch)

Load at the assembled length ... 50 ± 4 N (11.0 ± 1.0 lb)

Operating length ... 21 mm (0.8 inch)

Load at the operating length ... 125 ± 10 N (28.0 ± 2.0 lb)

Free length after test ... 44.33 mm (1.745 inch)

Diameter of the spring ... 15.50 mm (0.610 inch)

(18) As required, use the shims to obtain a load of 368 ± 15 N (83.0 ± 3.0 lb). Hold both springs between the spring retainers. The length of the springs should be 43.00 ± 0.10 mm (1.692 ± 0.004 inch) (C).

(19) Position the stem with the yellow mark on this side.

(20) 185-7709 Relief Valve

Pressure setting at a flow rate of 4 L/min (1.1 US gpm) ... 24150 ± 350 kPa (3500.0 ± 50.0 psi)

Maximum flow rate ... 40 L/min (10.6 US gpm)

Torque for the nut ... 24 ± 3 N·m (18.0 ± 2.0 lb ft)

Torque for the relief valve ... 45 ± 5 N·m (33.0 ± 4.0 lb ft)

(21) Load check valve

Torque for the load check valve ... 190 ± 20 N·m (140.0 ± 15.0 lb ft)

Assembled length of the 4T-3148 Spring ... 24 mm (0.95 inch)

Load of the spring at the assembled length ... 4.0 ± 2.2 N (0.90 ± 0.50 lb)

Free length of the spring after the test ... 34.80 mm (1.370 inch)

Diameter of the spring ... 5.4 mm (0.21 inch)

(22) 186-0903 Relief Valve

Pressure setting at a flow rate of 20 L/min (5.3 US gpm) ... 12800 ± 350 kPa (1850.0 ± 50.0 psi)

Torque for the relief valve ... 45 ± 5 N·m (33.0 ± 4.0 lb ft)

Torque for the nut ... 14 ± 2 N·m (10.0 ± 2.0 lb ft)

Torque for the cap ... 14 ± 2 N·m (10.0 ± 2.0 lb ft)

Illustration 4	g00896889

Illustration 5	g00896897

(23) As required, use the shims to obtain a load of 323 ± 15 N (73.0 ± 3.0 lb). Hold both springs between the spring retainers. The length of the springs should be 43.00 ± 0.10 mm (1.692 ± 0.004 inch) (C).

(24) Torque for the load check valve ... 45 ± 5 N·m (33.0 ± 4.0 lb ft)