HOUSING-BRAKE 1104792 - Caterpillar

Specification
Table 1
"Power Shift Pressure - Check"
Item Engine Machine Settings Specification Commanded(1) Actual(2)
Power Shift Pressure No Load Speed Dial "10"
AEC switch OFF 3150 300 kPa (457 43 psi)
Power Shift Pressure Load(3) Speed Dial "10"
AEC switch OFF 750 300 kPa (109 43 psi)
(1) Value from the monitor
(2) Value from the pressure gauge
(3) Two pump main relief (Stick In)Introduction
The power shift pressure check insures the commanded power shift pressure matches the actual power shift pressure during a two pump stall condition.Preliminary Tests
Testing and Adjusting, "Engine Performance - Test (Engine Speed)"
Testing and Adjusting, "Relief Valve (Pilot) - Test and Adjust"
Testing and Adjusting, "Relief Valve (Main) - Test and Adjust"
Testing and Adjusting, "Solenoid Valve (Proportional Reducing) - Calibrate (Power Shift Pressure)"Required Tools
Illustration 1 g02571852
Tooling (A) 198-4240 Digital Pressure Indicator Gp
Table 2
Tool Item Qty Part
Number Description
A 198-4240 Digital Pressure Indicator Gp
A1 1 198-4234 Indicator
A2 1 198-4237 Pressure Sensor 3447 kPa (500 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 2 g03567361
Pump compartment
(1) Pressure tap (delivery pressure for front pump 1)
(2) Pressure tap (delivery pressure for rear pump 2)
(3) Pressure tap (power shift pressure)
(4) Pressure tap (front pump 1 negative flow)
(5) Pressure tap (rear pump 2 negative flow)
Connect a 3447 kPa (500 psi) pressure sensor to pressure tap (3) to monitor power shift pressure. Test Procedure
Start the engine.
Increase the hydraulic oil temperature to 55° 5°C (131° 9°F).
Place the machine controls at the following settings: engine speed dial "10" and AEC switch OFF. Refer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for engine rpm settings.
Check the commanded power shift pressure on the monitor. Check the actual power shift pressure at pressure tap (3). The actual power shift pressure should be 3150 350 kPa (457 43 psi).
Move the joystick for the stick until the stick is at the full STICK IN position (full extension of stick cylinder). Hold the joystick for the stick in this position.
Check the commanded power shift pressure on the monitor. Check the actual power shift pressure at pressure tap (3). The power shift pressure should be 750 300 kPa (109 43 psi).
Return the joystick to the NEUTRAL position.
If the power shift pressure is not within specification, proceed to Testing and Adjusting, "Main Pump (Flow) - Test (Hydraulic Power)".