SEAL A 7G7072 - Caterpillar

Lowering with Electrical Power
Extended operation of the secondary steering motor could damage the motor and result in loss of emergency steering capability, which could cause injury or death. The Secondary Steering System should not be used for towing the machine or for other service procedures lasting longer than 5 minutes. The motor should be allowed to cool to ambient temperatures before reuse.
When the engine is stopped, the hoist must be supplied with pilot oil pressure in order to lower the body. The brake release and secondary steering pump can be used in order to provide pilot oil to the hoist.Refer to Operation and Maintenance Manual, "Operator Controls" for the location of the controls that are used to lower the body with the engine stopped.
Illustration 1 g03117119
Cutaway view of the frame.
Pull out knob (1) on the diverter valve in order to supply brake oil to the parking brake release valve. Pull out the knob on the diverter valve and then rotate the knob in order to lock the valve in position.
Turn the engine start switch to the ON position.
Move the hoist lever to the RAISE position for 15 seconds. Then, move the hoist lever to the FLOAT position.
Illustration 2 g02197793
Depress the switch (2) for the brake release and the secondary steering pump in order to begin lowering the body. Hold the switch until the body is completely lowered.
Rotate the knob on the diverter valve in order to unlock the valve. Push in on the knob for the diverter valve in order to return the hoist/brake system to normal operation. Lowering without Electrical Power
If the engine is inoperable and the machine is without electrical power, use an auxiliary power unit (APU) as a separate hydraulic source. An APU that is designed to use with this machine is available through your Caterpillar dealer. Consult your Caterpillar dealer for further information on the selection and the proper operation of an APU.