SHAFT-YM 3919809 - Caterpillar

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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(1) Pump adapter (2) Gauge (3) Relief valve (4) Handle (5) Bypass valve (6) Brake release pump (7) Brake release adapterThe machine brakes can be released for towing. Use FT1973 Adapter (1), two 123-0525 Adapters (7), and FT1845 Pump (6) .Pump Test
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.
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Remove the components that are indicated by shaded area (A) .
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(7) Brake release adapter (1) Pump adapter
Connect two brake release adapters (7) to FT1973 Adapter (1). Connect FT1973 Adapter (1) to the pump pressure hose.
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(8) Brake control valve (9) Brake valve ports
Remove the fittings from the top of brake valve ports (9) .
Install one 123-0525 Adapter into each of the brake valve ports.
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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(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.
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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(5) Bypass valveOpen 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