HOUSING AS-AXLE 2050203 - Caterpillar

Illustration 4 g02062913
Switch for heavy lift
Set the switch for heavy lift to the OFF position. The indicator light should not be illuminated.
Move the joystick for the boom until the boom is at the full BOOM RAISE position (full extension of boom cylinders).
Check the pressure reading for the main relief valve pressure setting. Refer to Table 1.
Return the joystick for the boom to the NEUTRAL position.
Illustration 5 g02061934
Switch for heavy lift
Set heavy lift switch (A) to the ON position. Make sure that the indicator light is on.
Move the joystick for the boom until the boom is at the full BOOM RAISE position (full extension of boom cylinders).
Check the pressure reading for the setting for heavy lift of the main relief valve. Refer to Table 1.
Return the joystick for the boom to the NEUTRAL position.Adjustment Procedure
Standard
Remove the access plate below the main control valve in order to locate the main relief valve.
Illustration 6 g02102305
Main relief valve (A) Adjustment screw (L) Locknut
Loosen the locknut and turn the adjustment screw until the pressure reading at the pressure tap for the drive pump is within the specification. Refer to Table 1.Note: Turn the adjustment screw clockwise in order to increase the pressure. Turn the adjustment screw counterclockwise in order to decrease the pressure.Note: Always make final pressure adjustments on pressure rise.
Tighten the locknut.Heavy Lift
Illustration 7 g02061719
Main relief valve (heavy lift) (LH) Locknut for heavy lift (AH) Adjustment screw for heavy lift (LM) Locknut for main relief (AM) Adjustment screw for main relief
Illustration 8 g02103561
Cutaway of the main relief valve (heavy lift operation) (LH) Locknut for heavy lift (AH) Adjustment screw for heavy lift (LM) Locknut for main relief (AM) Adjustment screw for main reliefWhen the main relief pressure setting is adjusted, the pressure setting for heavy lift is not affected. When adjustment screw (AM) is turned counterclockwise in order to decrease the main relief setting, the pressure difference between the main relief setting and the pressure setting for heavy lift will increase. When adjustment screw (AM) is turned clockwise in order to increase the main relief setting, the pressure difference between the main relief setting and the pressure setting for heavy lift will decrease. When the pressure setting for heavy lift is increased, the main relief setting is also increased. When the pressure setting for heavy lift is decreased, the main relief setting is also decreased. The relief valve pressure setting for heavy lift and the relief pressure setting for the main relief are shown in Table 1.
Remove the access plate below the main control valve in order to locate the main relief valve.
Illustration 9 g02061934
Switch for heavy lift
Heavy lift switch (A) must be set to the ON position. Make sure that the indicator light is on.
Loosen locknut (LM) . Turn adjustment screw (AM) clockwise until the adjustment screw stops.
Tighten locknut (LM) .
Loosen locknut (LH) .
Move the joystick for the boom until the boom is at the full BOOM RAISE position (full extension of boom cylinders).
Check the pressure reading for the setting for heavy lift of the main relief