PR-750B PAVEMENT PROFILER 250 Hour Or Monthly Service Caterpillar

1. Change the engine oil and filters.

2. Check the battery electrolyte level, clean the batteries and check the electrical connections and wiring.

3. Check the air compressor, alternator, fan drive and water system pump drive belts.

4. Check the pump drive gearbox drive belt bands.

5. Check the optional high pressure water pump oil level.

6. Check the engine coolant lines and connections.

7. Change the coolant conditioner elements and/or add cooling system inhibitor.

Changing The Engine Crankcase Oil And Filters

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THE MAINFRAME COULD FALL AND CAUSE PERSONAL INJURY. LOWER THE SUPPORT LEGS INTO POSITION WHENEVER WORKING UNDER THE MACHINE.

WITH THE ENGINE STOPPED and the oil warm:

1. Remove the crankcase oil drain plug.

2. Allow the oil to drain.

3. Clean and install the drain plug.

4. Unscrew and remove the filters.

5. Be sure neither old filter gasket remained attached inside the filter bases. Leaking will occur between the new filter gasket and the old gasket.

6. Wipe the filter base.

7. Apply a thin coat of clean oil to the gasket of the new filters.

8. Install the new filters. Hand tighten each filter 3/4 turn after the filter gasket contacts the base. Use the rotation index numbers painted on the filter can as a guide for proper tightening.

9. Fill the crankcase to the safe starting range on the ENGINE STOPPED side of the dipstick. See page 5-1 for refill capacity, oil type and oil viscosity.

10. Start the engine and check for oil leaks.

11. After the engine is warm, check the oil level with the engine idling.

12. Add oil, if necessary, to maintain the oil level at the FULL mark on the ENGINE IDLING side of the dipstick.

Checking The Battery Electrolyte Level

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HYDROGEN GAS FROM THE BATTERIES IS FLAMMABLE AND COULD IGNITE OR EXPLODE, CAUSING SERIOUS BURNS OR INJURIES FROM FLYING PARTICLES. NEVER SMOKE OR HAVE AN OPEN FLAME WHEN NEAR THE BATTERIES.

1. Shut the engine down and turn the main battery disconnect switch to "Off".

2. Maintain electrolyte level at the base of each vent well.

3. Make-up water must be one of the following (in order of preference):

a. Distilled water.

b. Odorless, tasteless drinking water.

c. Iron free water.

d. Any available water.

4. Turn the main battery disconnect switch to "On".

Cleaning The Batteries

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HYDROGEN GAS FROM THE BATTERIES IS FLAMMABLE AND COULD IGNITE OR EXPLODE, CAUSING SERIOUS BURNS OR INJURIES FROM FLYING PARTICLES. NEVER SMOKE OR HAVE AN OPEN FLAME WHEN NEAR THE BATTERIES.

1. Shut the engine down and turn the main battery disconnect switch to "Off".

2. Mix a solution of baking soda and water (1/4 pound to a quart of water). Apply the solution to the batteries, battery box and cable clamps with a bristle brush.

3. Thoroughly rinse the battery and battery box with clean water.

4. Apply grease to the battery cable clamps and terminals and to all threads.

5. Turn the main battery disconnect switch to "On".

Checking The Electrical Connections And Wiring

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INADVERTENT STARTING OF THE ENGINE COULD CAUSE PERSONAL INJURY. SHORTING OF HOT WIRES COULD CAUSE BODILY BURNS AND DAMAGE TO THE ALTERNATOR. SHUT THE ENGINE DOWN, REMOVE THE KEY FROM THE IGNITION SWITCH, AND TURN THE BATTERY DISCONNECT SWITCH TO "OFF".

1. Check for loose, broken or corroded connections.

2. Check wiring insulation for breaks, cracks, fraying or other defects.

3. Repair or replace components as necessary to maintain tight, uncorroded connections and sound wiring.

4. Turn the main battery disconnect switch to "On".

Checking The Drive Belts

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HOT EXHAUST DUCTING CAN CAUSE SERIOUS BURNS. INADVERTENT STARTING OF THE ENGINE COULD CAUSE PERSONAL INJURY. SHUT THE ENGINE DOWN, REMOVE THE KEY FROM THE IGNITION SWITCH AND ALLOW THE ENGINE TO COOL.

Check all the drive belts for signs of wear or fraying and replace any belts that show such signs. Also check and adjust the belt tension.

Replace all belts in a set when one is worn. Single belts of similar size should not be used as a substitute for a matched set; premature belt wear can result because of belt length variation. All belts in a matched set are within .032 inch (0.8 mm) of their specified distances.

New standard V-belts will stretch after the first few hours of operation. Run the engine for 15 seconds to set the belts then retighten them. Retighten the fan drive, water pump drive, battery-charging alternator and other accessory drive belts after 1/2 hour and again after 8 hours of operation. Thereafter, check the tension of the drive belts every 200 hours and adjust, if necessary. Too tight a belt is destructive to the bearings of the driven part; a loose belt will slip.

To check the tension of the V-belts apply a force midway between the two pulleys and check the belt deflection. The correct force and deflection for each V-belt is given below. Check each belt of a set separately.

Checking The Pump Drive Gearbox Drive Belt Bands

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INADVERTENT STARTING OF THE ENGINE COULD CAUSE PERSONAL INJURY. SHUT THE ENGINE DOWN AND REMOVE THE KEY FROM THE IGNITION SWITCH.

1. Check the belt bands for breaks, cracks, burned spots, separation from the tie band, or excessive wear. Check the tie bands for fraying, holes or blisters. If the condition of any belt band is questionable, replace all the belt bands.

2. Check EACH belt band for proper tension with a belt tension gauge. The gauge should read 60 to 80 pounds (27.3 to 36.4 kg) for a belt deflection of 3/8 inch (9.5 mm).

3. If the belt tension is not correct, adjust the tension as described below.

Adjusting The Pump Drive Gearbox Drive Belt Bands

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INADVERTENT STARTING OF THE ENGINE COULD CAUSE PERSONAL INJURY. SHUT THE ENGINE DOWN AND REMOVE THE KEY FROM THE IGNITION SWITCH.

1. Loosen the gearbox support mounting bolts.

2. Loosen the adjusting bolt jam nut.

3. Turn the adjusting bolt to obtain the proper belt tension, then tighten the jam nut.

4. Tighten the gearbox support mounting bolts.

Checking The Optional High Pressure Water Pump Oil Level

Stop the pump before checking the oil level. Maintain the oil level in accordance with the markings on the dipstick. USE ATF TYPE F HYDRAULIC OIL.

Checking The Engine Coolant Lines And Connections

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HOT ENGINE COMPONENTS CAN CAUSE SERIOUS BURNS. INADVERTENT STARTING OF THE ENGINE COULD CAUSE PERSONAL INJURY. SHUT THE ENGINE DOWN, REMOVE THE KEY FROM THE IGNITION SWITCH AND ALLOW THE ENGINE TO COOL.

Check all coolant line connections on the engine and tighten any that are loose. Check for cracked, soft or otherwise deteriorated hoses. Replace any bad ones.

Changing The Engine Coolant Conditioner Elements

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AT OPERATING TEMPERATURE, ENGINE COOLANT IS HOT AND UNDER PRESSURE. STEAM CAN CAUSE PERSONAL INJURY. CHECK COOLANT LEVEL ONLY, WHEN ENGINE IS STOPPED AND RADIATOR CAP IS COOL ENOUGH TO TOUCH WITH YOUR HAND. REMOVE FILLER CAP SLOWLY TO RELIEVE PRESSURE. COOLING SYSTEM INHIBITOR CONTAINS ALKALI. AVOID CONTACT WITH SKIN AND EYES TO PREVENT PERSONAL INJURY.

When fresh engine coolant consisting of either plain water or water and antifreeze is installed, a precharge element should be installed for use until the first normal element change period.

1. Close the inlet valve and the outlet valve at the element base. Turn clockwise to close both valves.

2. Remove the coolant conditioner element. Discard the element.

3. Clean the element mounting base. Make certain all of the old element gasket material is removed.

4. Use the correct maintenance element for your cooling system. Maintenance elements are sized to the coolant system capacity.

5. Coat the seal of the element with a thin film of clean engine oil or antifreeze.

6. Install the element until the seal contacts the base, then tighten an additional 3/4 turn.

7. Open the inlet valve and the outlet valve.

8. Start the engine and check for leaks.