KIT-SEAT SUSPENSION 3334157 - Caterpillar

Specification
Table 1
"Margin Pressure - Test and Adjust"
Item Machine Settings Specification Actual
Margin Pressure Speed Dial "10"
AEC switch OFF 1500 100 kPa (218 15 psi)
Illustration 1 g03783234
Margin pressure adjustment screw
(1) Load sensing valve
(2) Locknut
(3) Margin pressure adjustment screw
Table 2
Torque Specification
Item Part Torque
(2) Locknut 22 2 N m (16.2 1.5 lb ft) Introduction
Margin pressure is the difference between the pump discharge pressure and the load sensing signal pressure.
Illustration 2 g03783223
Main pump
(1) Load sensing valve
(4) Pressure tap (main pump pressure)
(5) Pressure tap (load sensing pressure) Required Tools
Illustration 3 g02571852
Tooling (A) 198-4240 Digital Pressure Indicator Gp
Table 3
Tool Item Qty Part Number Description
A 198-4240 Digital Pressure Indicator Gp
A1 1 198-4234 Indicator
A2 1 198-4239 Pressure Sensor 41,368 kPa (6,000 psi)
A3 1 198-4236 Extension Cable Machine Preparation
Position the machine on level ground and stop the engine.
Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "System Pressure - Release".
Illustration 4 g03783247
Pressure tap for the pump and load sensing valve
(4) Pressure tap (main pump pressure)
(5) Pressure tap (load sensing pressure)
Attach a 41,368 kPa (6,000 psi) pressure sensor to pressure tap (4) for the main pump pressure.
Attach a 41,368 kPa (6,000 psi) pressure sensor to pressure tap (5) for the load sensing pressure. Test Procedure
Start the engine.
Place the machine controls at the following settings: engine speed dial "10" and AEC switch OFF.
Increase the hydraulic oil temperature to 55° 5°C (131° 9°F).
Check the margin pressure on the pressure gauges. The margin pressure should be 1500 100 kPa (218 15 psi). Note: Margin pressure is the difference between main pump pressure and load sensing signal pressure.
If the margin pressure setting is not within the specification, adjust the margin pressure setting. Adjustment Procedure
Illustration 5 g03783234
Margin pressure adjustment screw
(1) Load sensing valve
(2) Locknut
(3) Margin pressure adjustment screw
Remove cap of load sensing valve (1).
Loosen locknut (2) and turn margin pressure adjustment screw (3) until the pressure reading at the pressure tap for the pump is 1500 100 kPa (218 15 psi). 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 locknut (2) to a torque of 22 2 N m (16.2 1.5 lb ft).
Install 6E-5060 Cap As on margin pressure adjustment screw (3).