R1700 Load Haul Dump Power Train, Steering, Braking, Hydraulic, and Machine Systems Caterpillar

Brake Release System Air - Purge

Usage:

R1700K KT4

Show/hide table

Personal injury or death can result if two persons are not used in the following procedure.

Show/hide table

Personal injury or death can result from machine movement.

Place blocks in front of and behind the wheels to make sure the machine does not move while the parking brakes are disengaged.

Show/hide table

NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, PERJ1017, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat^® products. Dispose of all fluids according to local regulations and mandates.

This procedure is used to purge air from the brake release system.

Show/hide table

Table 1
Required Tools
Tool	Qty	Part No	Description
-	1	-	Transparent tube 6.4 mm (0.25 inch) Diameter

Check the hydraulic tank oil level. Make sure that you maintain the correct oil level in the hydraulic tank throughout the air removal procedure.
Engage the parking brake and stop the engine.
Install the steering frame lock.
Reference: Refer to Operation and Maintenance Manual, "Steering Frame Lock" for the machine being serviced.
Put blocks in front of the wheels and behind the wheels.

Start the engine. Allow the braking system oil pressure to increase to the cut-out pressure.
Disengage the parking brake. Keep the engine running and maintain the brake accumulator and the pilot system pressure within working limits throughout the air removal procedure.
Show/hide table

Illustration 1 g06143929

(1) Air purge valve
Connect the transparent tube to air purge valve (1) on the brake release cylinder. Place the other end of the transparent tube into a suitable container for collecting the hydraulic oil. Open air purge valve (1) one-half turn.
Engage and disengage the parking brake until hydraulic oil, without air bubbles, flows through the tube into the container.
Close air purge valve (1) and remove the transparent tube.
Show/hide table

Illustration 2 g06152615

Steering release diverter valve location

Show/hide table

Illustration 3 g06272855

(2) Air purge valve
(3) Steering release diverter valve
Connect the transparent tube to air purge valve (2) on steering release diverter valve (3). Place the other end of the transparent tube into a suitable container for collecting the hydraulic oil. Open air purge valve (1) one-half turn.
Engage and disengage the parking brake until hydraulic oil, without air bubbles, flows through the tube into the container.
Close air purge valve (2) and remove the transparent tube.
Remove the steering frame lock.
Reference: Refer to Operation and Maintenance Manual, "Steering Frame Lock" for the machine being serviced.