330F MHPU Mobile Hydraulic Power Unit Machine System Power Shift Pressure - Check Caterpillar


Power Shift Pressure - Check
`
1.1. Specification
2.1. Introduction
3.2. Preliminary Tests
4.1. Required Tools
5.1. Machine Preparation
6.1. Test Procedure

Specification

Table 1
"Power Shift Pressure - Check" 
Item  Machine Settings  Specification  Commanded(1)  Actual(2) 
Power Shift Pressure
(No Load) 
Speed Dial "10"
AEC switch OFF 
4000 ± 250 kPa (580 ± 36 psi)     
Power Shift Pressure
(Full Load) 
Speed Dial "10"
AEC switch OFF 
1150 ± 300 kPa (167 ± 44 psi)     
(1) Value from the monitor
(2) Value from the pressure gauge

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, "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 1g02726620

Table 2
Tool  Item  Qty  Part No  Description 
B1  8T-0856  Pressure Gauge
6000 kPa (870 psi) 
B2 6V-3989  Fitting 
B3 6V-4143  Quick Connect Coupler 
B4 177-7862  Hose As
5.5 m (18 ft) 

Machine Preparation

  1. Position the machine on level ground and stop the engine.

  2. Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "System Pressure - Release".


    Illustration 2g03712895
    Pump compartment
    (1) Pressure tap (delivery pressure for drive pump)
    (2) Pressure tap (delivery pressure for idler pump)
    (3) Pressure tap (power shift pressure)

  3. Connect a 6000 kPa (870 psi) pressure gauge to pressure tap (3) to monitor power shift pressure.

Test Procedure

  1. Start the engine.

  2. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).

  3. 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.

  4. Check the commanded power shift pressure on the monitor. Check the actual power shift pressure at pressure tap (3). Refer to Table 1 for the specification.

  5. Move the joystick for the boom until the boom is at the full BOOM RAISE position (full extension of boom cylinders). Hold the joystick for the boom in this position.

  6. Check the commanded power shift pressure on the monitor. Check the actual power shift pressure at pressure tap (3). Refer to Table 1 for the specification.

  7. Return the joystick to the NEUTRAL position.

  8. If the power shift pressure is not within specification, proceed to Testing and Adjusting, "Main Pump (Flow) - Test (Hydraulic Power)".

Information System:

313D2 and 313D2 GC Excavator Machine Systems Specifications Track Roller Mounting
314F and 315F Excavators Machine System Specifications Swing Drive Mounting
336D 2L and 340D 2L Excavators Machine Systems Final Drive and Travel Motor - Remove and Install
314F and 315F Excavators Machine System Specifications Boom Cylinder Lines
314F and 315F Excavators Machine System Specifications Fuel Tank
314F and 315F Excavators Machine System Specifications Boom Cylinder Lines
314F and 315F Excavators Machine System Specifications Swing Drive
314F and 315F Excavators Machine System Specifications Boom Cylinder Lines
336D 2L and 340D 2L Excavators Machine Systems Boom - Remove and Install
GSH420, GSH425, GSH440, GSH520, GSH525, GSH455 and GSH555 Orange Peel Grapples Bushings (Grapple) - Remove and Install
314F and 315F Excavators Machine System Specifications Boom Lines
314F and 315F Excavators Machine System Specifications Pilot Valve
325F Excavator Machine Systems Counterbalance Valve (Travel) - Remove and Install
330F MHPU Mobile Hydraulic Power Unit Machine System Gear Pump (Pilot) - Test
325F Excavator Engine Supplement Diesel Exhaust Fluid Tank - Remove and Install
330F MHPU Mobile Hydraulic Power Unit Machine System Specifications
314F and 315F Excavators Machine System Specifications Boom Cylinder Lines
336D 2L and 340D 2L Excavators Machine Systems Swing Motor - Remove and Install
314F and 315F Excavators Machine System Specifications Boom Cylinder Lines
314F and 315F Excavators Machine System Specifications Manifold and Reducing Valve (Pilot Oil)
349F and 352F Excavators Engine Supplement Fan Drive - Remove and Install - Direct Drive - Type 2
314F and 315F Excavators Machine System Specifications Boom Cylinder Lines
314F and 315F Excavators Machine System Specifications Boom Cylinder Lines
314F and 315F Excavators Machine System Specifications Pilot Valve (Blade)