GAGE-VALVE 6V7068 - Caterpillar

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.
Place the transmission control in the NEUTRAL position.
Illustration 1 g00560102
Use parking brake switch (1) in order to engage the parking brake.
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, NENG2500, "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.
Block the wheels.
When towing the machine, attach tow line to the front tow hooks or rear tow pin only.
Hook up the towing machine. Refer to this Operation and Maintenance Manual, "Towing the Machine" for guidelines.
Illustration 2 g00901917
Attach a 8T-0857 Pressure Gauge and a line on one pressure tap (2) at the junction block. The pressure taps (2) are located in the parking brake release lines.
Check the steering on the disabled machine. If the steering needs assistance, use an auxiliary power unit as a separate hydraulic source. Consult your Caterpillar dealer for further information.
Illustration 3 g00604253
Use the parking brake switch (1) in order to release the parking brake. Turn the engine start switch to the ON position. Move brake release switch (3) to the ON position. Hold brake release switch (3) until the message area of the VIMS indicates that the parking brake is released.
The parking brake must be fully released. Partial brake engagement and brake damage could occur if proper hydraulic pressure is not maintained.Do not allow the parking brake release pressure to drop below 3445 kPa (500 psi) when the towed machine is moving.
Apply the service brake pedal on the disabled machine in order to check the braking. If the brakes are functioning, release the brakes.
Rotate the steering wheel to each side in order to check the steering.
Remove the blocks from the wheels.
Pull the disabled machine with the towing machine. Watch the pressure gauge that was installed in Step 5. Do not continue to tow the machine if the oil pressure is below 3445 kPa (500 psi).