FORK CARR 0801852 - Caterpillar

Propulsion System Pressure Checks
Two people are required to make any tests or adjustments to the machine with the engine running. One person at the controls and one person making the tests or adjustments.
A. Propulsion System Intake Vacuum Test
1. Disconnect the intake line from the tandem propulsion pumps.2. Install a tee at the inlet port and attach a vacuum gauge to the tee branch.3. Connect the intake line to the tee. 4. If the hydraulic fluid is cold, run the engine at idle. The vacuum gauge should read a maximum of 10 inches (25.4 cm) of mercury.5. If the hydraulic fluid is warm, run the engine at full throttle. The vacuum gauge should read a maximum of three inches (7.62 cm) of mercury.B. Propulsion System Charge Pump Pressure Test
1. Remove the plug from one of the charge pump gauge ports.2. Install a 500 psi (3500 kPa) gauge in the gauge port with a short length of hose and a snubber or needle valve (to dampen pulsations). A device should be used to dampen the needle pulsations within the gauge such as a snubber, needle valve, or liquid filled gauge.3. With the engine at full throttle, the gauge should read approximately 130 psi (896 kPa).C. General System Pressure Test
1. Remove the two 1/8" plugs on the high pressure ports and insert two 10,000 psi (68,940 kPa) gauges. 2. Start the engine and carefully move the unit up against a solid object, such as a loading dock, to make certain that the machine is immobilized. 3. Start the engine and run full throttle. Slowly advance the propel lever forward until the track slips. The gauge should peak at between 3500 and 4000 psi (24,000 and 27,000 kPa) depending on the surface the unit is standing on.4. Make the same check of the operating pressure of the other pump. Track slippage should occur at approximately the same pressure for both pumps.Troubleshooting Propulsion System
Component Replacement
A. Track Removal And Replacement
1. Each track has one master pin connecting it into a loop. Two roll pins hold the master pin in place.2. Remove one of the roll pins from the master pin. Drive the master pin out of the track from this side. 3. Slide the track off the axles. Jack up the machine to slide the track out from under it.4. Lay the new track out under the machine. Align the teeth of the track with the spaces between the teeth of the drive axle sprocket and lower the machine down onto the new track.5. Feed the ends of the track up over the axles.6. Install the master pin to couple the ends together. Secure the master pin with roll pins.7. Check the track tension following the instructions in the Operator's Manual.