D7E Track-Type Tractor Hydraulic, HVAC, and Electrical Systems Implement Hydraulic Force Is Low Caterpillar


Implement Hydraulic Force Is Low
`
1.1. Probable Causes
2.1. Recommended Actions
3.2. Implement Cutoff Setting Is Too Low
4.2. The Machine Is Being Operated Improperly
5.2. The Pilot System Pressure Is Too Low
6.2. The Control Current To The Solenoid Is Not Correct
7.2. The Position Sensor For The Lift Control Lever Is Damaged
8.2. The Main Control Valve Is Contaminated Or Damaged
9.2. The Makeup Valve Is Sticking

Probable Causes

  • Implement cutoff setting is too low.

  • The machine is being operated improperly.

  • The pilot system pressure is too low.

  • The control current to the solenoid is not correct.

  • The position sensor for the lift control lever is damaged.

  • The main control valve is contaminated or damaged.

  • The makeup valve is sticking.

Recommended Actions

Note: Care must be taken in order to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the machine. You must be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component that contains fluid. Dispose of all fluids according to local regulations.

Implement Cutoff Setting Is Too Low

Refer to Testing and Adjusting, "Piston Pump (Implement) - Test and Adjust" in this manual.

The Machine Is Being Operated Improperly

Interview the operator in order to determine if the machine has been operating at stall conditions or near stall conditions.

The Pilot System Pressure Is Too Low

Refer to Testing and Adjusting, "Accumulator (Pilot) - Test and Charge" in this manual.

The Control Current To The Solenoid Is Not Correct

Refer to Testing and Adjusting, "Calibration" in this manual.

The Position Sensor For The Lift Control Lever Is Damaged

Refer to Testing and Adjusting, "Operational Checks (Hydraulic System)" in this manual.

The Main Control Valve Is Contaminated Or Damaged

Refer to Testing and Adjusting, "Calibration" in this manual.

The Makeup Valve Is Sticking

If the makeup valve is sticking and not operating freely, there may be a pause in movement at the ground when lowering the blade. If the makeup valve leaks, "Down Pressure" may be weak. In the extreme, the implement may move UP, from external forces, with the control valve in the HOLD position.

Information System:

2009/07/27 Improved Procedure for the Retention of the Identification Film for the Roll Over Protective Structure (ROPS) and Falling Object Protective Structure (FOPS) {7323, 7325, 7405, 7557}
2010/01/06 A New Lip Seal for the Final Drive Is Now Used {4050, 4052}
2012/04/09 Improved Friction Disc and Software for the Torque Converter Impeller Clutch on 988H Wheel Loaders {3101, 7610, 7620}
953D, 963D and 973D Track-Type Loaders Hydrostatic Drive Is Sluggish
953D, 963D and 973D Track-Type Loaders Machine Top Speed Is Not Obtained
953D, 963D and 973D Track-Type Loaders Machine Movement Is Unstable
953D, 963D and 973D Track-Type Loaders Hydraulic System Hesitates
2009/10/01 A New Slip Joint Group Improves Service Life of the Drive Shaft {3251}
D7E Track-Type Tractor Hydraulic, HVAC, and Electrical Systems Implement Droops Before Raising
C9.3 Tier 4 Final Engines Diesel Particulate Filter Has High Ash Load
IT38H Integrated Toolcarrier and 938H Wheel Loader Declaration of Conformity
966H and 972H Wheel Loaders Declaration of Conformity
2009/09/28 New Software Released For AccuGrade Office {5267, 7220}
2009/07/27 New Air Lines and a New Air Motor Are Now Used to Improve the Capability of the Cold Start {1450, 1451, 1462, 1466}
621G Wheel Tractor-Scraper Maintenance Interval Schedule
627G Wheel Tractor-Scraper Maintenance Interval Schedule
613G Wheel Tractor-Scraper Maintenance Interval Schedule
D7E Track-Type Tractor Hydraulic, HVAC, and Electrical Systems Implement Cycle Time Is Slow for All Implements
953D, 963D and 973D Track-Type Loaders Hydraulic System Pressure Is High
TS180, TS185, TS220 and TS225 Towed Scrapers Declaration of Conformity
953D Track-Type Loader Declaration of Conformity
2011/01/06 Improvements to the Fuel Sender Group {1273, 1408, 6201, 7481, 7857}
D9T Track-Type Tractor Battery Disconnect Switch
D7E Track-Type Tractor Hydraulic, HVAC, and Electrical Systems Hydraulic Cylinder Collapse - The Lift Cylinder Will Collapse When The Control Is In The Raised Position