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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. |
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Personal injury or death can result from worn wire rope cable. Worn or frayed cable could break causing injury. Check the wire rope cable. If cable is worn or is frayed install a new cable. |
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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 Caterpillar 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 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 degree 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. Maximum towing machine capacity is required on inclines or on surfaces that are in poor condition.
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 Caterpillar 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 Caterpillar dealer or refer to the machine's Service Manual for axle shaft removal and installation procedures.
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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. |
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Carefully follow all instructions that are outlined in the Towing Information. Ensure that the instructions are followed exactly.
Stopped Engine
You can move the machine when the engine is not operable. You must use a brake release pump.
Consult your Caterpillar dealer for the equipment that is necessary for towing a disabled machine.
The pressure hoses from the pump connect to the brake valve. The pump takes oil from the sump of the brake release pump. Then, the pump pressurizes the brake piston cavity in order to release the brake.
Note: This machine is free to move. This machine is free to roll away. This machine has no braking ability when both brakes have been released.
Connection of Brake Release Pump
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| Illustration 1 | g00544401 |
(1) Pump adapter (2) Gauge (3) Relief valve (4) Handle (5) Bypass valve (6) Brake release pump (7) Brake release adapter | |
The machine brakes can be released for towing. Use FT1973 Adapter (1), two 123-0525 Adapters (7), and FT1845 Pump (6) .
Pump Test
| NOTICE |
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Possible brake piston seal damage could result without checking relief valve. Opening pressure must be checked and adjusted before connection is made. |
- The main pressure hose connects to FT1973 Adapter (1) and the two 123-0525 Adapters. Plug the pressure hose at the connection.
- Turn the handle of bypass valve (5) to the closed position.
- While you are pumping handle (4), observe the opening pressure of relief valve (3) .
- 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 brake valve ports before you proceed.
- Remove the components that are indicated by shaded area (A) .
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| Illustration 2 | g00543819 |
- Connect two brake release adapters (7) to FT1973 Adapter (1). Connect FT1973 Adapter (1) to the pump pressure hose.
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| Illustration 3 | g00543758 |
(7) Brake release adapter (1) Pump adapter | |
- Remove the fittings from the top of brake valve ports (9). See Illustration 4 for the correct brake valve ports.
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| Illustration 4 | g00601622 |
(8) Brake control valve (9) Brake valve ports marked BK. | |
- Install one 123-0525 Adapter into each of brake valve ports (9) .
- 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.
- Replace the floorplate.
- Place the brake release pump in front of the operator.
- Fasten the seat belt. Continue to the next topic.
Brake Release
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| Illustration 5 | g00544462 |
(4) Bypass valve handle | |
- Turn bypass valve handle (4) to the CLOSED position.
- Initially, rapidly move the pump handle. This will produce a large volume of oil flow.
- The brake piston seal must be fully seated. The 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.
- Now, the machine can be towed.
| NOTICE |
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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
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| Illustration 6 | g00544463 |
(5) Bypass valve | |
Open bypass valve (5) 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 brake release pump. Repair the machine. Install the floorplate.
Consult your Caterpillar dealer for towing a disabled machine.