776D, 777D and 777D HAA Off-Highway Truck/Tractors Steering System Caterpillar

Illustration 1	g00519566

Bench test requirements:

Oil ... SAE 10W

Stabilized oil temperature ... 60 °C (140 °F)

Note: Use a bench test to accurately set the pump pressure.

Pump pressure ... 2510 ± 440 kPa (364 ± 64 psi)

Maximum standby pressure ... 2950 kPa (428 psi)

Pressure cutoff at zero flow ... 23425 ± 350 kPa (3400 ± 50 psi)

(1) 6E-3274 Spring (Outer)

Length under test force ... 14.4 mm (0.57 inches)

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

Free length after test ... 15.9 mm (0.63 inches)

Outside diameter ... 7.7 mm (0.30 inches)

(2) 6E-3275 Spring (Inner)

Length under test force ... 15.1 mm (0.59 inches)

Test force ... 40.2 ± 2.8 N (9.0 ± 0.6 lb)

Free length after test ... 20.5 mm (0.81 inches)

Outside diameter ... 10.7 mm (0.42 inches)

(3) Setscrew

(4) Spool

Note: Apply 9S-3263 Thread Lock Compound to the threads of setscrew (3). Setscrew (3) is located in the end of the spool (4) .

(5) 6E-3276 Spring

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

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

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

Outside diameter ... 19.2 mm (0.76 inches)