PR-750B PAVEMENT PROFILER Preparing The Machine For Operation Caterpillar


Preparing The Machine For Operation
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1.1. Installing The Cutter
2.1. Installing The Elevation Sensors And Grade Sensing Wheels Or Optional Averaging Skis
3.2. Installing a Grade Sensing Wheel and Sensor
4.2. Installing an Optional Averaging Ski
5.1. Installing The Steering Indicator
6.1. Checking Calibration Of The Cross Slope Sensor

Installing The Cutter

1. Park the machine on level ground with the engine running and the park brake control at "On". Move the cutter on the shipping skid near to the right front side of the machine.
2. Raise the mainframe enough to clear the cutter, turn the front track to the far right limit, use the lower conveyor lift control valve to raise the front of the lower conveyor, then move the cutter into position.

3. Carefully lower the mainframe onto the cutter, install the four pins that connect the cutter to the mainframe, and lower the front of the lower conveyor until it engages the cutter. SHUT THE ENGINE DOWN.

------ WARNING! ------

INADVERTENT ENGAGEMENT OF THE CUTTER COULD CAUSE PERSONAL INJURY. SHUT THE ENGINE DOWN, LOCK THE CUTTER CONTROL AT "OFF", AND REMOVE THE KEY FROM THE IGNITION SWITCH.

------WARNING!--------

4. Bolt the U-joint drive to the pump drive gearbox drive sheave.
5. Connect the quick-disconnect couplings in the hoses for the moldboard cylinders, the cutter door cylinder, the spray bars on the cutter and the cutter clutch air system.
6. Plug in the cutter housing light wires.
7. Install the elevation sensors, grade sensing wheels and averaging skis, as needed (see below).

Installing The Elevation Sensors And Grade Sensing Wheels Or Optional Averaging Skis

The machine is shipped from the factory with the elevation sensors installed in the shipping mounts on the handrails and with the elevation sensors already plumbed into the HYDRA-MATION® system. The sensor on the right side of the machine controls the right rear elevation cylinder and the sensor on the left side controls the front elevation cylinder. To help prevent dirt from entering the HYDRA-MATION® system and damaging it, the hoses should never be disconnected from the sensors unless it is necessary for repair of system components.

Installing a Grade Sensing Wheel and Sensor

1. Position the machine on level grade with the cutter lowered onto the grade and the engine shut down.

------ WARNING! ------

DISENGAGE THE CUTTER CLUTCH, LOCK THE CLUTCH CONTROL AT "OFF" AND SHUT THE ENGINE DOWN BEFORE WORKING ON THE CUTTER. SERIOUS INJURIES CAN RESULT FROM INADVERTENT STARTING OF THE CUTTER.

------WARNING!--------
2. Bolt the slide tube mounting bracket to the cutter housing with the flanges to the outside of the housing.
3. Position the mounting arm and install the bolt that holds the mounting arm in the slide tube mounting bracket.

4. Assemble the pivot post, sensor mounting arm, pivot post mounting bracket, links, wheel mounting post and caster wheel.
5. Position the pivot post near the mounting arm with the wand guide toward the rear of the machine, then bolt the support brackets to the pivot post mounting bracket.
6. Slide the crank mounting bracket into the sensor mounting arm, insert the wand through the wand guide, then tighten the setscrew in the sensor mounting arm.

Installing an Optional Averaging Ski

1. Install the beam mounting bracket on the track yoke and slide a retainer onto the bracket.
2. Lift the beam into position and slide the end onto the beam mounting bracket.
3. Slide the beam guide onto the beam from the front and bolt the beam guide to the mainframe.
4. Center the beam in the guide, slide a second retainer onto the beam mounting bracket, move both retainers lightly against the beam, then tighten the setscrews in the retainers.
5. Install the caster wheels on the channel and the channel on the strut arm.
6. Position the strut near the front of the beam and install the support brackets.
7. Slide the sensor arm into the sensor mount, then slide the crank mounting bracket into the collar in the sensor arm.
8. Install the feeler rod on the beam and the wand guide on the feeler rod, then insert the sensor wand through the wand guide.
9. Position the collar on the crank mounting bracket and tighten the bolts.

Installing The Steering Indicator

The steering indicator is used to give the operator a reference to steer by during the cutting operation. The support arm mounts in a bracket on the front track guard and can be slid in or out to position the vertical rod. The rod runs through the support arm and can be moved up or down as needed.

Checking Calibration Of The Cross Slope Sensor

NOTE: THE CROSS SLOPE SENSOR IS A PRECISION INSTRUMENT THAT IS ACCURATELY CALIBRATED AT THE FACTORY. DO NOT ADJUST OR CHANGE THE POSITION OF THE POINTER, THE ADJUSTMENT GUIDE BLOCK, THE ADJUSTMENT SHAFT BEARINGS OR THE BELT THAT EXTENDS FROM THE ADJUSTMENT SHAFT TO THE SLOPE INDIAVSOR. IF NECESSARY, ADJUST BELT TENSION BY MOVING THE INDIAVSOR SUPPORT BRACKET. DO NOT MOVE THE ADJUSTMENT SHAFT BEARINGS.

The cross slope sensor is accurately calibrated to the cutter before the machine leaves the factory and will not normally require any further adjustment. If the machine is not cutting to the slope set in the slope indicator, the calibration of the cross slope sensor can be checked as follows:


CROSS SLOPE SENSOR (PENDULUM) ASSEMBLY

1. Check the cutter bits for even wear. If the bits are not evenly worn, replace all bits (see page 5-38).
2. Position the machine on a level slab or compacted dirt grade with the cutter above grade, set the park brake control at "On" and open the cutter door. Leave the engine running.
3. Set the slope indicator at "O", the cross slope selector at "R", both sensor selectors at "Off", and the automatic elevation selector at "On".
4. Use the front and left rear elevation controls to manaully lower the mainframe evenly until the cutter bits on the left end of the cutter are just contacting the slab and the mainframe is level fore and aft. If the bits in line across the bottom of the cutter are all just contacting the slab, the cutter is level. Proceed with normal operation of the machine.

5. If the cutter is not level, remove the pendulum cover and set an 8-inch (20 cm) mechanic's level (Starret No. 98 with ground and graduated main vial, or equal) on top of the adjustment guide yoke.
6. Move the cross slope selector to "Off" and use the elevation controls to adjust the cutter so that the bits in line across the bottom of the cutter are all just contacting the slab.
7. Loosen the jam nuts on the bolts in the bottom of the pendulum frame. Use the adjusting nuts to level the adjustment guide yoke. Tighten the jam nuts.

8. Loosen the setscrew in the pulley on the slope indicator shaft, hold the pulley so it will not turn and then turn the slope indicator shaft to set the slope indicator at "O". Tigthen the pulley setscrew.
9. Install the pendulum cover and proceed with normal operation of the machine. If the machine does not cut "Slope Right" or "Slope Left" according to the slope indicator, see "Calibrating the Cross Slope Sensor" in the Service Manual.