CONTROL GP-HANDLE 1741173 - Caterpillar

Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.
Make sure all of the equipment has been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hands.
10. Relieve all pressure in the hydraulic tank, by releasing vacuum breaker valve on tank, or by slowly removing tank fill cap. Make sure all hydraulic pressure is released before any fitting, hose, or component is loosened, tightened, removed, or adjusted.11. Tighten the fill cap on the hydraulic tank.* Raising Relief Pressure For Main Hydraulic System
1. Install a 50 000 kPa (7500 psi) gauge into the test tap in the manifold on 3G-2848 Piston Pump that supplies flow to 133-8675 Control Valve. 6E-6197 Relief Valve is used with each of two 3G-2848 Piston Pumps and one 1U-3840 Piston Pump.See Illustration 1 for Steps 2-4.
2. Loosen locknut (1) on 133-8675 Control Valve and turn adjusting screw (2) out (counter-clockwise) nine turns.3. Loosen locknut (4) on 133-8675 Control Valve and turn adjusting screw (3) in (clockwise) until heavy resistance is met. Do not force adjusting screw beyond this point.4. With engine speed at high idle, read gauge in pump manifold. Pressure should be 30 400 kPa (4400 psi).See Illustration 2 for Steps 5 and 6.
5. Loosen locknut (8) on 6E-6197 Relief Valve (being tested).6. Turn adjuster (9), approximately two turns in (clockwise), until the gauge in the pump manifold reads 40 000 kPa (5800 psi).7. Shut engine OFF.See Illustration 1 for Steps 8, 9, and 10.
8. Remove adjusting screw (3) and locknut (1) on 133-8675 Control Valve.9. Turn adjusting screw (2) in (clockwise) and tighten to 25 6 N m (18 4 lb ft).10. Install adjusting screw (3) and tighten 25 6 N m (18 4 lb ft).11. Install locknut (1) and (4).See Illustration 2 for Step 12.
12. Lower pressure setting of the other two 6E-6197 Relief Valves by loosening locknut (8) and turning the adjuster out (counterclockwise) 3 1/2 turns.* Testing 9T-9196 Control Valve
1. Operate bucket and lift circuits to bring system up to operating temperature.
Personal Injury or death can result from bucket falling.
2. Lift bucket