D6M Track-Type Tractor Towing the Machine Caterpillar

Towing the Machine
1.1. Running Engine
2.1. Engine Stopped
3.1. Connection of Brake Release Pump
4.1. Pump Test
5.1. Connection for the Pump
6.1. Brake Release
7.1. Brake Engagement

------ 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.


This machine is equipped with spring applied brakes. These brakes are also oil pressure released brakes. If the engine or the system for pressure oil is inoperable, the brakes are applied and the machine cannot be moved. The machine can be moved if a brake release pump is used.

These towing instructions are for moving a disabled machine for a short distance at low speed. Move the machine at a speed of 2 km/h (1.2 mph) or less to a convenient location for repair. These instructions are only for emergencies. Always haul the machine if long distance moving is required.

This machine can be towed by removing the axle shafts from the final drives. This will make the machine brakes inoperable and the machine can move freely. Refer to the machine's Service Manual or consult your AVSpare dealer for the removal procedure for the axle shaft and for the installation procedure for the axle shaft.

Shields must be provided on both machines. This will protect the operator if either the tow line or the bar breaks.

Do not allow an operator to be on the machine that is being towed unless the operator can control the steering and/or the braking.

Before towing, make sure that the tow line or the bar is in good condition. Make sure that the tow line or the bar has enough strength for the towing procedure that is involved. The strength of the towing line or of the bar should be at least 150 percent of the gross weight of the towing machine. This is true for a disabled machine that is stuck in the mud and for towing on a grade.

For towing, only attach the tow line to the tow eyes on the frame, if equipped.

Do not use a chain for pulling a disabled machine. A chain link can break. This may cause possible personal injury. Use a wire rope cable with ends that have loops or rings. Put an observer in a safe position in order to watch the pulling procedure. The observer can stop the procedure, if necessary. The procedure should be stopped if the cable starts to break. Also, stop the procedure if the cable starts to unravel. Stop pulling whenever the towing machine moves without moving the towed machine.

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 bar. This could cause the tow line or the bar to break. Gradual, steady machine movement will be more effective.

Normally, the towing machine should be as large as the disabled machine. Make sure that the towing machine has enough brake capacity, enough weight, and enough power. The towing machine must be able to control both machines for the grade that is involved and for the distance that is involved.

You must provide sufficient control and sufficient braking when you are moving a disabled machine downhill. This may require a larger towing machine or additional machines that are connected to the rear. This will prevent the machine from rolling away out of control.

All situation requirements cannot be listed. Minimal towing machine capacity is required on smooth, level surfaces. On inclines or on surfaces in poor condition, maximum towing machine capacity is required.

When any towed machine is loaded, the machine must be equipped with a brake system that is operable from the operator's compartment.

Consult your AVSpare dealer for the equipment that is necessary for towing a disabled machine.

Running Engine

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.

If an internal transmission or a drive line failure is suspected, remove the axle shafts.

Consult your AVSpare dealer or refer to the machine's Service Manual for axle shaft removal and installation procedures.

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

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

Block the tracks 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.

Be 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.


Ensure that all instructions that are outlined in the Towing Information are carefully followed and exactly followed.

Engine Stopped

You can move the machine when the engine is not operable. You must use a brake release pump.

Consult your AVSpare dealer for the equipment that is necessary for towing a disabled machine.

The pressure hose from the pump connects to the brake valve. The pump takes oil from the sump of the brake release pump. Then, the pump pressurizes the brake valve in order to release the brake.

Note: This machine is free to move. This machine is free to roll away and this machine has no braking ability when both brakes have been released.

Connection of Brake Release Pump

Illustration 1g00040674

The machine brakes can be released for towing. Use FT1973 Adapter Group (5) , 123-0525 Adapter , and FT1845 Pump Group (1) .

Pump Test


Possible brake piston seal damage could result without checking relief valve. Opening pressure must be checked and adjusted before connection is made.

  1. The main pressure hose connects to the FT1973 Adapter Group (5) and the 123-0525 Adapter . Plug the pressure hose at the connection.

  1. Turn the handle of the bypass valve (4) to the closed position.

  1. While you are pumping the handle (3) , observe the opening pressure of the relief valve (2) .

  1. Adjust the opening pressure of the relief valve. Set the pressure to 3030 ± 70 kPa (440 ± 10 psi) .

Connection for the Pump

Remove the floorplate in order to access the steering valve ports before you proceed.

  1. Remove the fitting from the top of the steering valve ports. The ports are marked "BK" .

  1. Install the 123-0525 Adapter into the ports. Connect the remainder of the FT1973 Adapter Group to the pump pressure hose.

  1. Route the pressure hose under the floorplate in the cab. Then route the pressure hose to the pump. The pump is temporarily on the platform.

  1. Replace the floorplate.

  1. Place the pump group in front of the operator.

  1. Move the parking brake switch to the DISENGAGED position.

  1. Fasten the seat belt. Continue to the next topic.

Brake Release

Illustration 2g00040676

  1. Turn the bypass valve handle to the CLOSED position.

  1. Initially, rapidly move the pump handle. This will produce a large volume of oil flow.

  1. The brake piston seal must be fully seated. Seating of the seal is evident by a sudden rise in the oil pressure.

    When the seal is properly seated, the pressure rises to the maximum.

  1. Now, the machine can be towed.


Do not allow pressure to drop below 2756 kPa (400 psi) while towing.

Partial brake engagement could occur and can result in brake damage.

Brakes must be fully released when towed machine is moving.

Brake Engagement


Do not use the machine brakes to slow or stop the machine. Extensive brake damage and system contamination can result.

Illustration 3g00040676

Open the bypass valve in order to apply the brakes. This will completely dump the oil.

The brake system can only be applied by turning the bypass valve. The service brake pedal and the steering levers do not function.

After towing, remove the pump group. Repair the machine. Install the floorplate.

Consult your AVSpare dealer for towing a disabled machine.