950G Series II Wheel Loader, 962G Series II Wheel Loader and IT62G Series II Integrated Toolcarrier Hydraulic System Implement Cycle Time - Check Caterpillar


Implement Cycle Time - Check
`
1.1. Machine Preparation
2.1. Cycle Time Check
3.2. RAISE
4.2. LOWER
5.2. DUMP
6.2. TILT BACK
7.1. Possible Causes for Incorrect Times

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

Sudden movement or accidental starting of the machine can cause personal injury or death to persons on or near the machine.

To prevent personal injury or death, perform the following:

Park the machine on a smooth, level surface.

Lower the work tool to the ground and engage the parking brake.

Stop the engine and remove the key.

Block the wheels and install the steering frame lock.


The implement cycle time can be checked in order to verify a complaint about slow implement speed. This test will also help to determine whether all functions are slow or only one function is slow.

Note: For all cycle time tests, the work tool must be empty.

Machine Preparation

  1. Move the machine to an open area so that the work tool can be fully raised.

  2. Park the machine on a smooth, level surface. Park the machine away from working machines and personnel. Lower the work tools to the ground.

  3. Allow only one operator on the machine. Keep all personnel away from the machine or in the view of the operator.

  4. Engage the parking brake.


    Illustration 1g00914095

  5. Place the steering frame lock in the LOCKED position.

    Reference: For more information about preparing the machine for troubleshooting, refer to the Service Manual module Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.

  6. Perform the torque converter stall test in order to verify that the engine is developing adequate power.

    For more information about performing the torque converter stall test, refer to the Service Manual module Troubleshooting and Testing and Adjusting, RENR4310, "Torque Converter Stall - Check" for the machine that is being serviced.

  7. Shift the transmission to neutral.

  8. Start the engine. Warm the hydraulic oil to normal operating temperature. The hydraulic oil must be at a temperature of 65 ± 3°C (150 ± 5°F) in order to obtain accurate results.

Cycle Time Check

Table 1
Implement Cycle Times (Seconds) 
Machine  Raise  Lower  Tiltback  Dump 
950G Series II  6.3 ± 0.5  4.8 ± 0.5  2.7 ± 0.5  2.3 ± 0.5 
962G Series II  6.3 ± 0.5  4.8 ± 0.5  2.7 ± 0.5  2.1 ± 0.5 
IT62G Series II  6.2 ± 0.5  5.4 ± 0.5  2.9 ± 0.5  2.6 ± 0.5 

RAISE

  1. Move the work tool to the TILT BACK position.

  2. Lower the work tool completely.

  3. Increase the engine RPM to high idle.

  4. Move the lift control lever to the RAISE position. Hold the lift control lever in this position until the lift cylinder reaches the end of travel. Record the amount of time that is required for the work tool to travel from the ground to the full RAISE position.

    Refer to Table 1 for the correct cycle time for the machine that is being serviced.

LOWER

  1. Position the work tool so that the work tool is flat on the ground.

  2. Raise the work tool to the maximum height.

  3. Move the work tool to the full TILTBACK position.

  4. Increase the engine RPM to high idle.

  5. Move the lift control lever to the full LOWER position.

    Note: Ensure that the lift control lever is not in the FLOAT position.

    Record the time from the full LIFT position to the ground.

    Refer to Table 1 for the correct cycle time for the machine that is being serviced.

DUMP

  1. Position the lift linkage at the midpoint of travel. Tilt back the work tool as far as possible.

  2. Increase the engine RPM to high idle.

  3. Move the tilt control lever to the full DUMP position. Hold the tilt control lever in this position until the work tool is at the full DUMP position. Record the time to the full DUMP position.

    Refer to Table 1 for the correct cycle time for the machine that is being serviced.

TILT BACK

  1. Position the lift linkage at the midpoint of travel.

  2. Position the work tool in the FULL DUMP position.

  3. Increase the engine RPM to high idle.

  4. Move the tilt control lever to the full TILT BACK position. Hold the tilt control lever in this position until the work tool is against the stop. Record the time from the level position to the full TILT BACK position.

    Refer to Table 1 for the correct cycle time for the machine that is being serviced.

Possible Causes for Incorrect Times

If the times are not correct, check the following conditions:

  1. Check the pressure setting of the main relief valve.

    Reference: For information on setting the pressure of the main relief valve, refer to the Service Manual module Testing and Adjusting, "Relief Valve (Main)" for the machine that is being serviced.

  2. Check the pressure setting of the line relief valves.

    Reference: For information on setting the line relief valves, refer to the Service Manual module Testing and Adjusting, "Relief Valve (Line) - Test and Adjust" for the machine that is being serviced.

  3. Check the condition of the implement pump.

    Reference: For information on checking the condition of the implement pump, refer to the Service Manual module Testing and Adjusting, "Pump Performance (Implement) - Test" for the machine that is being serviced.

  4. Check the makeup valves in the lift control valve and in the tilt control valve.

  5. Check the spools in the main control valve for proper movement.

  6. Check the piston seals in the cylinders.

Information System:

793C XQ Off-Highway Truck and 793C Off-Highway Truck Engine Supplement Radiator - Remove
814F Wheel Dozer, 815F Soil Compactor and 816F Landfill CompactorEngine Supplement Engine, Torque Converter, Transmission and Output Transfer Gears - Install
140H and 160H Motor Graders Engine Supplement Muffler - Remove and Install
R2900 Load Haul Dump Air Conditioning and Heating Control
140H and 160H Motor Graders Engine Supplement Fuel Priming Pump - Remove and Install
3054E and 3056E Industrial Engines and Engines for Caterpillar Built Machines Electronic Service Tools
14H Motor Grader 3176C Engine Supplement Hood - Install
226 and 242 Skid Steer LoadersEngine Supplement Engine - Remove
2002/09/02 Parts for the Planetary for the A19 Auger Are Now Serviced {5904, 7000}
3054E Industrial Engine Fuel Injection Pump
Troubleshooting Failures of the Exhaust Tube on 3408E and 3412E Engines{1061}
3500 and 3500B High Displacement Engines for Caterpillar Built Machines Engine Oil Cooler - Install
950G Series II Wheel Loader, 962G Series II Wheel Loader and IT62G Series II Integrated Toolcarrier Hydraulic System Pump Performance (Implement) - Test
TK711 Track Feller Buncher, TK721 Track Feller Buncher, TK722 Track Feller Buncher and TK732 Track Feller Buncher Machine Systems Stick
3500 and 3500B High Displacement Engines for Caterpillar Built Machines Exhaust Manifold - Remove and Install
554 and 574 Forwarders Power Train Power Train Drive Loop Speed - Test and Adjust
PS-360B Paving Compactor Light Switches
140H and 160H Motor Graders Engine Supplement Engine Oil Filler - Remove and Install
776D, 777D and 777D HAA Off-Highway Truck/Tractors Air System and Brakes Brake Oil Overheating Troubleshooting
793C Off-Highway Truck Machine Systems Ladder - Remove and Install
776D, 777D and 777D HAA Off-Highway Truck/Tractors Power Train Electronic Control (Body Up or Down Sensor)
574B Forwarder Power Train Power Train Drive Loop Speed - Test and Adjust
3054E Industrial Engine Crankshaft - Steel Crankshaft
814F Wheel Dozer, 815F Soil Compactor and 816F Landfill CompactorEngine Supplement Engine to Torque Converter, Transmission, Output Transfer Gears - Connect