VALVE AS 1492403 - Caterpillar

Table 1
Tools Needed    
Qty     Pt. No.     Description    
2     6V-3965     Valved Nipple    
2     3J-1907     O-ring Seal    
2     8T-0856     Pressure Gauge
0 to 6000 kPa (0 to 870 psi)    
2     6V-3989     Nipple    
2     6V-3014     Hose Assembly    
2     6V-4143     Valved Coupler    
1     8F-0024     Hose Assembly    
2     6V-4144     Valved Coupler    
Operate the machine in order to bring the oil to an operating temperature of 65 °C (149 °F).
Steer the tractor to the right 90°. This will provide an area away from the elevator chain. Stop the engine.
Illustration 1 g00657697
(1) Piston pump (elevator) (2) Pressure test port (3) Electric solenoid (4) Eccentric adjustment screw (5) Pressure test port (6) Electric solenoid (7) Adjustment screw (8) Pressure test port (9) Pressure test port
Disconnect the line from pressure test port (2). Remove the two plugs from pressure test ports (2) and (5). Remove the two orifices under the two plugs.
Install two 3J-1907 O-Ring Seals and two 6V-3965 Fittings in pressure test ports (2) and (5) .
Install the 8F-0024 Hose Assembly with two 6V-4144 Couplers on the two fittings from step 4. This will provide the same pressure at both ends of the pump control piston.
Remove the two plug-in electrical signals to electrical solenoids (3) and (6) .
Install two 6V-3014 Hose Assemblies with two 6V-4143 Couplers and two 8T-0856 Pressure Gauges with two 6V-3989 Unvalved Nipples on pressure test ports (8) and (9) .
Start the engine. Loosen the locknut on adjustment screw (7). Turn the adjustment screw until the same pressure is shown on both gauges. The control piston is centered. Hold the adjustment screw. Tighten the locknut.
Stop the engine. Remove the hose assemblies from pressure ports (2) and (5). Remove the hose assemblies with the gauges from pressure test ports (8) and (9) .
Install the hose assemblies with the gauges on ports (2) and (5) .
Loosen the locknut on the eccentric adjustment screw (4). Turn in the eccentric adjustment screw (4) until you feel a resistance. Turn out the eccentric adjustment screw (4) until you complete one revolution.
Start the engine. Loosen the locknut on eccentric adjustment screw (4). Eccentric adjustment screw (4) can be turned in one quarter turn in order to make the pressures on the two gauges equal. Eccentric adjustment screw (4) can also be turned in the opposite direction in order to make the pressures on the two gauges equal. When the pressure is equal the control spool is centered. Hold the eccentric adjustment screw (4) in position. Tighten the locknut on eccentric adjustment screw (4). Check the pressure gauges again.
Stop the engine. Remove the two hose assemblies and two pressure gauges from pressure test ports (2) and (5). Remove two O-ring seals and two fittings from pressure test ports (2) and (5). Install the two orifice plugs that were removed in step 3.