NO. 112, 120 & 140 MOTOR GRADERS When Required Caterpillar

(56)Engine Air Intake System

Service air cleaner element if RED band in indicator is locked up. Stop engine.

Servicing Primary Elements

1. Remove cover. Remove element. ¹

2. Clean inside of air cleaner body. Clean cover.

3. Clean and inspect element. (See page 35.) Install clean element.

4. Install cover. Reset indicator.

If indicator shows RED shortly after installation of clean primary element, and element has been cleaned 6 to 8 times, change element.

If new primary element was used, and indicator shows RED, service secondary element.

Servicing Secondary Element

1. Remove cover and primary element. Remove secondary element. NOTE: Housing is secured with element bolts and will come off.

2. Cover air inlet opening.

3. Clean and inspect element. Use new gasket. Uncover air inlet.

4. Install secondary element and housing. Tighten nuts to 20 ± 5 lb. ft. (2,8 ± 0,7 mkg).

5. Install primary element and cover. Reset indicator.

If indicator shows RED shortly after cleaning, change secondary element.

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⁽¹⁾Never service air cleaner elements while engine is running.

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NOTICE
Tighten cover retainer bolts to 3 lb. ft. (0.4 mkg).

Engine Air Intake System (140 Only)

Service air cleaner element if RED band in indicator is locked up. Stop engine.

Servicing Primary Elements

1. Remove cover. Remove element.

2. Clean inside of air cleaner body. Clean cover.

3. Clean and inspect element. (See page 35.) Install clean element.

4. Install cover. Reset indicator.

If indicator shows RED shortly after installation of clean primary element, and element has been cleaned 6 to 8 times, change element.

If new primary element was used, and indicator shows RED, service secondary element.

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NOTICE
Tighten cover retainer bolts to 3 lb. ft. (0.4 mkg).

Servicing Secondary Element

1. Remove cover and primary element. Remove secondary element.

2. Cover air inlet opening.

3. Clean inside of air cleaner body.

4. Clean and inspect element (See page 35).

5. Check precleaner. Clean all parts when necessary.

6. Remove cover.

7. Remove precleaner.

8. Clean parts with compressed air, a stiff fiber brush or wash in water and non-sudsing detergent. Dry all parts before installation.

9. Uncover air inlet opening. Install secondary element and housing. Tighten nuts to 20 ± 5 lb. ft. (2,8 ± 0,7 mkg).

10. Install primary element. Install cover.

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NOTICE
Tighten cover retainer bolts to 3 lb. ft. (0.4 mkg).

11. Reset filter indicator.

Cleaning Air Cleaner Elements

Pressure Air - 100 PSI (7 kg/cm²) Maximum

1. Direct air inside element along length of pleats.

2. Direct air outside along length of pleats. Direct air inside along length of pleats.

3. Check element.

Water - 40 PSI (3 kg/cm²) Maximum

1. Direct water inside element along length of pleats.

2. Direct water outside along length of pleats. Rinse element.

3. Air dry thoroughly. Check element.

Detergent

1. Wash in warm water and non-sudsing household detergent.

2. Rinse with clean water (40 psi max.). See above.

3. Air dry thoroughly. Check element.

Checking Element

1. Insert light inside clean and dry element. Check and discard element if pinholes or tears are found.

2. Wrap and store good elements in a clean dry place.

Do not clean elements by bumping or tapping.

Have spare elements on hand to use while cleaning used elements.

Do not use elements with damaged pleats, gaskets or seals.

(57)Diesel Fuel System

Primary Filter Element - Clean

1. Clean element when fuel gauge registers OUT with engine running.

2. Close fuel supply valves. One valve located on each side of machine, under operator's compartment.

3. Remove filter bowl and element.

4. Wash element in kerosene.

5. Install element and bowl. Open fuel valves.

Final Filter - Change

1. If fuel pressure still registers OUT with engine running, change final fuel filter. Close supply valves.

2. Remove final filter with strap type wrench.

3. Clean filter base gasket surface.

4. Lubricate new filter gasket with clean diesel fuel.

5. Install new filter by hand. When gasket contacts base, tighten 1/2 turn more.

6. Open supply valves and prime fuel system.

7. Start engine and check for fuel leaks.

Fuel Tank - Drain

Open valves and drain water and sediment. (One valve on each side of tank at bottom.) Close valves.

Priming the Fuel System

1. Move governor control to OFF position. Open vent valve.

2. Unlock priming pump plunger. Operate plunger until flow of fuel from drain tube is free of bubbles. Close pump, lock plunger and close vent valve.

Fuel Tank Breather - Clean Element

1. Remove wing nut, washers and element. Wash parts in non-flammable, oil free cleaning fluid.

2. Shake element dry and install element, washers and nut.

Fuel Tank Filler - Clean Strainer

1. Remove fuel filler cap. Pry out strainer snap ring and remove strainer.

2. Clean strainer in kerosene or diesel fuel. Install strainer, snap ring and cap.

(58)Cooling System

Whenever draining and refilling the cooling system, always recheck the coolant level when the engine reaches normal operating temperature. Remove cap and maintain coolant level 1/2" (1 cm) below the bottom of the fill pipe.

Use clean water that is low in scale forming minerals - not softened water.

Never add coolant to an overheated engine. Allow engine to cool first.

Add AVSpare Rust Inhibitors to coolant except when using permanent-type antifreeze containing rust inhibitors.

Check specific gravity of antifreeze solution frequently in cold weather to assure adequate protection.

Cleaning the Cooling System

1. Run engine for 5 minutes. Park machine on level ground and stop engine.

2. Turn filler cap slowly to relieve pressure, then remove caps.

3. Open drain valve and drain coolant.

4. Close drain valve and fill with cleaning solution. ⁽¹⁾

5. Start and run engine for 1/2hour. Stop engine and drain cleaning solution.

6. Flush system with clean water until draining water is clear.

7. Close drain valve and fill system with neutralizing solution. ⁽²⁾

8. Start and run engine for 10 minutes. Stop engine and open drain valve.

9. Flush system with clean water.

10. Close drain valve and add coolant to proper level.

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⁽¹⁾2 lb. Sodium Bisulfate (NaHSO₄) per 10 gal. water (25 grams per liter).

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⁽²⁾1/2 lb. Sodium Carbonate Crystals (Na₂CO₃, 10 H₂O) per 10 gal. water (6 grams per liter).

NOTE: Most commercial cooling system cleaners may be used.

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Use all cleaning solutions with care.

(59)Ball And Sockets - Adjust

1. Remove ball socket cap and shims.

2. Install ball cap without shims. Tighten bolts evenly.

3. Measure gap between socket halves. Remove cap.

4. Install cap with shims equal to gap, plus one shim.

(60)Wheel Brakes - Adjust

1. Use brake adjusting tool part no. 5S9925.

2. Remove dust cover from front of brake backing plate.

3. Move shoe against drum. Rotate star wheel by pushing down on tool.

4. Back star wheel off 2 notches.

5. Install front dust plug and remove dust plug from rear of backing plate.

6. Move shoe against drum by pulling up on tool to rotate star wheel.

7. Back star wheel off 2 notches.

8. Test brakes. Check hydraulic brake fluid level. Add fluid as necessary.

(61)Parking Brake - Adjust

Handle Knob

1. It should require a firm pull to snap handle over center.

2. Turn knob clockwise to tighten, counterclockwise to loosen.

Linkage

1. With brake released, tighten handle knob.

2. Back knob off 4 full turns.

3. Loosen linkage clevis locknut.

4. Remove cotter pin from clevis.

5. Remove pin.

6. Remove clevis from lever. Screw clevis onto cable 4 full turns.

7. Install clevis.

8. Install pin and cotter pin.

9. Complete adjustment with handle knob.

10. Check adjustment. Lining must be free when brake is released.

Brake is properly adjusted when it holds machine when applied, and lining is free when it is released.

(62)Shear Pin - Replace

1. Shear pin is in pair of flanges located in lower part of power box housing.

2. Stop engine. Remove cotter pin, loosen nut and swing cover aside. Tighten nut.

3. Remove shear pin pieces.

4. Install new shear pin.

5. Loosen cover bolt and position cover. Tighten bolt and install cotter pin.

6. Start engine and check out controls.

(63)Cutting Edge And End Bits Cutting Edge - Change

1. Remove cutting edge bolts.

2. Loosen end bit bolts.

3. Remove cutting edge.

4. Install new cutting edge. Use new bolts if necessary.

End bits - Reverse or Change

1. Remove end bit bolts and remove end bit.

2. If only one edge has been used, reverse and use on opposite side. Install new one if necessary.

(64)Blade Lift Worm Gears

Adjust at one housing on each side. Loosen locknut. Turn adjusting screw in until it bottoms. Hold screw and tighten locknut.

(65)Blade Lift Brakes

Adjust one brake each side. Tighten adjusting nut until lining makes contact with brake block. Nut is self-locking.

Hydraulic Parking or Emergency Brake (if equipped)

ACCUMULATOR

Check nitrogen precharge pressure. Your AVSpare dealer has equipment to make this check.