515 Wheel Skidder and 525 Wheel Skidder Machine Retrieval Caterpillar


Machine Retrieval
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1.1. Towing with the Engine Idle
2.1. Towing with the Engine Stopped

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

Personal injury or death could result when towing a disabled machine incorrectly.

Block the machine to prevent movement before releasing the brakes. The machine can roll free if it is not blocked.


In order to properly perform the towing procedure, use the following recommendations.

This machine is equipped with spring applied parking brakes. The parking brakes are released by oil pressure. If the engine is inoperable or if the brake oil system is inoperable, the parking brakes are applied. The machine cannot be moved.

Use these towing instructions for moving a disabled machine over a short distance. Do not move the machine faster than 2 km/h (1.2 mph). Move the machine to a convenient location for repair. Use these instructions for emergency situations only. Always haul the machine if long distance moving is required.

Shielding must be provided on the towing machine in order to protect the operator in case the tow line breaks or the tow bar breaks.

Do not allow riders on the machine which is being towed.

Before you tow the machine, inspect the condition of the tow line or of the tow bar. Make sure that the tow line or the tow bar is sturdy enough to tow the disabled machine. The tow line or the tow bar must have a strength that is equal to 1.5 times the gross weight of the machine that is being towed. Use a tow bar with this strength or a tow line with this strength to tow a disabled machine that is stuck in the mud. Also, use a tow bar with this strength or a tow line with this strength to tow a disabled machine up a grade.

Do not use a chain for pulling. A chain link may break. This can cause personal injury. Use a wire cable with cable loops or end rings. Position an observer at a safe location. The observer should stop the pulling procedure if the cable starts to break or the cable starts to unravel. If the towing machine moves without the pulled machine, stop the pulling procedure.

Keep the tow line angle to a minimum. Do not exceed a 30° angle from the straight ahead position.

Quick machine movement could overload the tow line or the tow bar. This could cause the tow line or the tow bar to break. Gradual, smooth machine movement is recommended.

Normally, the towing machine should be as large as the disabled machine. The towing machine must have enough brake capacity, enough weight, and enough power for the grade that is involved and for the distance that is involved.

It may be necessary to connect a larger machine or additional machines to the machine that is disabled. This will provide sufficient control for moving a disabled machine downhill and sufficient braking for moving a disabled machine downhill.

The requirements for different situations cannot be specified. Minimal towing machine capacity is required on smooth, level surfaces. Maximum towing machine capacity is required on inclines or on poor surface conditions.

Any towed machine with a load must be equipped with a brake system that can be operated from the operator's compartment.

When you tow the machine from the front, attach the tow line to the tow eyes on the frame. In order to tow the machine from the rear, attach the tow line to the recovery hitch.

Note: The recovery hitch is only for machine retrieval. Do not use the recovery hitch for any of the following:

  • a lifting point

  • a tie down point

  • towing a trailer

  • towing another vehicle

Consult your AVSpare dealer for more information about towing a disabled machine.

Towing with the Engine Idle

If the engine is running, the machine can be towed for a short distance under certain conditions. The power train and the steering system must be operable. Tow the machine for a short distance only. For example, pull the machine out of mud or pull the machine to the side of the road.

The operator on the towed machine must steer the machine in the direction of the tow line.

Carefully obey all of the instructions that are outlined in this topic.

Towing with the Engine Stopped

Perform the following steps before you tow the machine.



Illustration 1g00286064
Typical example
(A) Rod End
(B) Head End


    NOTICE

    Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.

    Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.

    Dispose of all fluids according to local regulations and mandates.



    NOTICE

    Be sure the cylinder hoses are connected correctly before operating the machine. With the hoses reversed, the steering system will not function.


  1. Reverse the hydraulic steering hose connections on one cylinder only. This will allow the steering cylinders to move freely.

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

    When the axle shafts are removed, the machine has no service or parking brakes. The machine can roll and cause personal injury or death.

    Block the wheels securely so that the machine cannot move.

    The towing connection must be rigid, or towing must be done by two machines of the same size or larger than the towed machine. Connect a machine on each end of towed machine.


  2. If failure of the internal transmission or of the drive train is suspected, remove the axle shafts.

    Reference: For more information on the axle shaft, refer to the Service Manual for your machine or consult your AVSpare dealer.


    NOTICE

    Release the parking brake to prevent excessive wear and damage to the parking brake system when towing the machine.


  3. Release the parking brake.

    Reference: For information about the manual release of the parking brake, refer to Operation and Maintenance Manual, "Parking Brake Manual Release".

  4. Inspect the machine for power train damage. If damage is suspected, remove the axle shafts.

  5. Fasten the tow bar.

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

    Personal injury or death can result from brake malfunction.

    Make sure all necessary repairs and adjustments have been made before a machine that has been towed to a service area, is put back into operation.


  6. Remove the wheel blocks. Tow the machine slowly. Do not exceed 2 km/h (1.2 mph).