D5R2 and D6R2 Track-Type Tractors Implement System Caterpillar


Implement System
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1.1. Problem List for the Implement System Components
2.1. Response of One Implement Is Too Slow
3.1. All Implement Cycle Times Are Too Slow
4.1. Implement Droops When Control Lever Is Moved From HOLD to LIFT
5.1. Implement Drift Is Excessive
6.1. All Implement Circuits Are Unstable
7.1. Implement Cycle Times Are Too Fast
8.1. Blade Has an Excessive Pause at Ground Level When Blade Is Lowered
9.1. Blade Will Not Float (All Other Implement Functions Operating Properly)
10.1. Pump Does Not Return to Standby Pressure After Implement Is Used
11.1. Blade Has Too Little Travel Before Quick-Drop Valve Is Activated
12.1. Blade Has Too Much Travel Before Quick-Drop Valve Is Activated
13.1. Quick-Drop Valve Is Not Working Properly
14.1. Ripper Does Not Function Properly
15.1. Hydraulic Circuits Have Weak Response

Before you complete any procedure, read Troubleshooting, "Machine Preparation for Troubleshooting" and Troubleshooting, "Visual Inspection"in this module.

------ WARNING! ------

To prevent personal injury when checks are made while the machine is in operation, make sure only approved personnel are on the machine. Keep other personnel off the machine and in view of the operator. Make sure checks are done in an open area.

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This story contains the following troubleshooting information:

  • Problems with the Implement System Components

Problem List for the Implement System Components

  • "Response of One Implement is Too Slow"

  • "All Implement Cycle Times Are Too Slow"

  • "Implement Droops When Control Lever Is Moved From HOLD to LIFT"

  • "Implement Drift Is Excessive"

  • "All Implement Circuits Are Unstable"

  • "Implement Cycle Times Are Too Fast"

  • "Blade Has an Excessive Pause at Ground Level When Blade Is Lowered"

  • "Blade Will Not Float (All Other Implement Functions Operating Properly)"

  • "Pump Does Not Return to Standby Pressure After Implement Is Used"

  • "Blade Has Too Little Travel Before Quick-Drop Valve Is Activated"

  • "Blade Has Too Much Travel Before Quick-Drop Valve Is Activated"

  • "Quick-Drop Valve Is Not Working Properly"

  • "Ripper Does Not Function Properly"

  • "Hydraulic Circuits Have Weak Response"

Response of One Implement Is Too Slow

Probable Causes

  1. The implement valve spool does not fully shift.

  1. A pilot solenoid valve is stuck.

  1. The wrong control valve for the implement is installed in the valve stack.

  1. The control valve is suspect.

  1. The shuttle valve is stuck or a seal is failed.

All Implement Cycle Times Are Too Slow

Probable Causes

  1. The margin pressure setting is too low.

  1. The pilot system pressure is too low.

  1. The pilot system has a blockage or a leakage. The problem is caused by the following causes:

    1. The pilot line is blocked or the pilot line is not hooked up.

    1. A shuttle valve is stuck or the valve has a failed seal.

    1. The flow control sleeve that is behind the flow control spring has a failed seal.

    1. The plug in the end of the control valve spool has a failed seal.

  1. The pump control is suspect.

  1. The pump is not operating at full stroke condition.

  1. The diameter of the hoses or the fittings are incorrect.

Implement Droops When Control Lever Is Moved From HOLD to LIFT

Probable Causes

  1. The load check valve is not closing. The problem is caused by the following causes:

    1. The spring in the load check valve is weak or broken.

    1. The load check valve has dirt or debris.

    1. The valve seat for the load check valve is suspect.

Implement Drift Is Excessive

Probable Causes

  1. The valve spool in the control valve is not correctly centered. The problem is caused by the following causes:

    1. The spring on the valve spool is broken.

    1. The valve spool is sticking.

    1. A pilot solenoid valve is stuck.

  1. The cylinder piston seals are leaking excessively.

  1. The makeup valve has excessive leakage or the makeup valve seals have failed.

  1. The quick-drop valve or the end stroke bypass valves are leaking excessively.

  1. The control valve has too much wear.

All Implement Circuits Are Unstable

Probable Causes

  1. The hydraulic oil is too thick or the oil is the wrong type. Warm the oil to operating temperature.

  1. The hydraulic pump is suspect.

  1. The oil contains air or air is trapped in a signal line.

Implement Cycle Times Are Too Fast

Probable Causes

  1. Check the selectable implement maps in ET for Configuring the settings for Slow, STD, and Fast Cycle times.

  1. Flow control valves or springs are failing.

  1. The wrong control valve spools are installed.

Blade Has an Excessive Pause at Ground Level When Blade Is Lowered

Probable Causes

  1. The quick-drop valve is not operating correctly.

  1. The makeup valve is stuck open.

  1. A hydraulic line is blocked.

Blade Will Not Float (All Other Implement Functions Operating Properly)

Probable Causes

  1. The blade lift control valve (bulldozer lift) is suspect.

    Check the long spring retainer on the blade lower side of the stem. The stem may have worn a step into the inside diameter of the retainer. Refer to Systems Operation, "Control Valve (Implement)" and Disassembly and Assembly, "Control Valve (Implement)".

  1. Pilot accumulator precharge is out of specification.

    Check the pilot accumulator. Refer to Testing and Adjusting, "Accumulator (Pilot) Test & Charge"

    If the precharge of the pilot accumulator is out of the specifications, the accumulator will need to be charged or replaced. Refer to Special Instruction, "Accumulator Discharging and Charging Procedures".

Pump Does Not Return to Standby Pressure After Implement Is Used

Probable Causes

  1. The hydraulic pump or the pump compensator valve is suspect.

  1. Valve spools have not returned to the center or HOLD position.

Blade Has Too Little Travel Before Quick-Drop Valve Is Activated

Probable Causes

  1. The springs in the quick-drop valve have the wrong number of shims.

  1. The orifice sleeve in the quick-drop valve is the wrong diameter.

  1. There is a short to battery on the solenoid.

Note: Feature can be enabled/disabled in the display but will automatically enable at each key on.

Note: If there is a short to battery on the solenoid, software will detect the short and open the return line. This will keep the blade from dropping.

Blade Has Too Much Travel Before Quick-Drop Valve Is Activated

Probable Causes

  1. The orifice sleeve in the quick-drop valve is missing or suspect.

  1. The quick-drop valve has a wrong spring or the quick-drop valve has too many shims.

  1. The orifices or the passages in the valve spool of the quick-drop valve are plugged with debris.

  1. The valve spool of the quick-drop valve is stuck or the quick-drop valve is jammed with debris.

Quick-Drop Valve Is Not Working Properly

Probable Causes

  1. Check in ET to make sure that the feature is installed.

  1. The orifice sleeve of the quick-drop valve is stuck.

  1. The valve spool of the quick-drop valve is stuck.

  1. The spring is weak or the spring is broken.

  1. The plug in the valve spool of the quick-drop valve is loose or missing.

Ripper Does Not Function Properly

Probable Causes

  1. A control valve spool is stuck. Check both the ripper lift control valve and the ripper tip control valve.

  1. A control valve spool is damaged. Check both the ripper lift control valve and the ripper tip control valve.

  1. A spring on a control valve spool is broken.

  1. The machine has a Ripper Shank Lower Anti drift solenoid installed and it is not working or getting activated.

Hydraulic Circuits Have Weak Response

Probable Causes

  1. The signal line is blocked or restricted.

  1. The pressure control valve is sticking.

  1. The pressure setting of the pump compensator valve is low.

  1. A spring in the pump control is broken.

  1. The implement pump is failing.

  1. The implement pump or the implement circuits have excessive internal leakage.

  1. The makeup valve is stuck open.

  1. The pressure setting of the main relief valve is wrong or the relief valve is suspect.

  1. The main control valve spools are sticking.

  1. The pilot solenoid or pilot valves are sticking.

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