TOWER 2435926 - Caterpillar

Note: Certain Caterpillar machines may be equipped with the optional transmission oil pressure switch for brake application. If your machine is equipped with the optional pressure switch, a loop wire needs to be connected to the wiring harness to enable the brake release function to operate.ReferenceFor further information on the transmission oil pressure switch for brake application refer to Systems Operation, Testing and Adjusting, "Parking Brake (Automatic Function)" for the machine that is being serviced.
Illustration 1 g00915694
(1) Transmission oil pressure switch for brake application (2) Loop wireNote: Perform Step 1 and Step 16 of the following procedure only to machines fitted with transmission oil pressure switch for brake application (1) .
Disconnect the transmission wiring harness from transmission oil pressure switch (1) at the electrical connector. Connect loop wire (2) between the EL331 BLUE wire and the EL330 GREY wire of the transmission harness, as shown.
Illustration 2 g00907315
212-6102 Portable Hydraulic Pump (3) Plug
Connect plug (3) of the 212-6102 Portable Hydraulic Pump to the machine's 24 volt DC power supply.Note: The machine batteries must be fully charged for the operation of the portable hydraulic pump. If battery charge is low, connect to an external 24 volt DC power supply.
Release the braking system oil pressure.ReferenceRefer to Systems Operation, Testing and Adjusting, "System Pressure - Release" for the machine that is being serviced.
Move the joystick control lever several times through the full range of travel. This will relieve any pressure that may be present in the implement hydraulic system.
Move the STIC steering control lever several times in both directions to release any pressure in the steering system.
Press and hold the breaker relief valve to release any pressure in the hydraulic tank.
Illustration 3 g00915695
(4) Quick connect coupler
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(5) Quick connect coupler
Remove the plugs from quick connect couplers (4) and (5). Connect the portable hydraulic pump hose assemblies to quick connect couplers (4) and (5) .
Turn the battery disconnect switch to the ON position.
Turn the engine start switch key to the ON position.
Illustration 5 g00907316
(6) Brake release switch
Position brake release switch (6) (from the portable hydraulic pump) inside the operator station.
Illustration 6 g00915697
Dash panel (7) Parking brake indicator (8) Brake accumulator oil pressure indicator (9) Parking brake control switch
Operating the portable hydraulic pump for extended periods of time may cause overheating and possible damage of the electric motor. If overheating is observed, stop operating the portable hydraulic pump and allow it time to cool before towing is continued.
Press and hold brake release switch (6) in the ON position to activate the portable hydraulic pump. Brake accumulator oil pressure indicator (8) will go out when the braking system has full oil pressure.Note: Operation of the brake release switch should only take place from inside the operator station. Observe brake indicators and gauges while operating the portable hydraulic pump.
When the braking system has full oil pressure, move parking brake control switch (9) to the OFF position to disengage the parking brake. Hold brake release switch (6) in the ON position until parking brake indicator (7) on the Caterpillar Monitoring System panel