143H and 163H Motor Graders Hydraulic and Steering System Blade Lift Relief Valve Caterpillar


Blade Lift Relief Valve
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Illustration 1g00008172

(1) Torque for nut with 3/8-40 thread on retainer assembly ... 12 ± 2 N·m (106 ± 18 lb in)

(2) Retainer assembly

Note: Hold retainer assembly (2) when you are tightening nut (1).




Illustration 2g00008174

(3) Torque for nut with 9/16-18 thread on retainer assembly ... 20 ± 2 N·m (15 ± 1.5 lb ft)

Note: Hold retainer assembly (8) when you are tightening nut (3) .

(4) Use 2A-3211 Washer, as required:

Outside diameter ... 12.3 mm (.48 inch)
Inside diameter ... 5.5 mm (.22 inch)
Thickness of washer ... 0.8 mm (.032 inch)

(5) 2J-6089 Spring :

Test length ... 36.25 mm (1.427 inch)
Test force ... 278 ± 14 N (63 ± 3 lb)
Free length after test ... 44.12 ± 0.50 mm (1.737 ± .020 inch)
Outside diameter ... 12.5 mm (.49 inch)

Assemble valve (7) to relief valve body (6) at assembly. To install the valve manually into the seat of the relief valve body, use the spring (5) to guide the valve into the seat. To drive the valve manually, use a bolt that is the same diameter as the valve stem.

When you install the relief valve, lubricate seals with a thin covering of lubricant that is being sealed.

For proper relief valve pressure setting, the temperature of the oil should be 49 ± 3°C (120 ± 37°F).

Relief valve pressure setting ... 31000 ± 700 kPa (4500 ± 102 psi)

Oil flow ... 2.0 ± 0.2 L/min (.53 ± .05 US gpm)

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