641B & 651B TRACTOR-SCRAPERS When Required Caterpillar

(35)Air Intake System

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Never service air cleaner with engine running.

Service air cleaners when RED band in indicator locks in visible position.

Primary Elements

1. Remove covers and primary elements.

2. Clean inside of air cleaner housings.

3. Clean and inspect elements. See page 29.

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NOTICE
Always inspect primary element before and after cleaning with a light bulb inside the element. Discard if any tears, rips or damage is evident.

4. Install clean elements and covers.

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NOTICE
Tighten the cover bolts finger tight, to 3 lb. ft. (4 N·m). Do not use a tool to tighten them.

5. Reset filter indicator.

If indicator shows RED shortly after installation of a primary element which has been cleaned approximately 6 times, change to another clean element.

NOTE: The primary element should be replaced after being cleaned a maximum of 6 times. Replace the element once a year even though it has not been cleaned 6 times.

If indicator still shows RED shortly after the installation of the clean primary element, change the secondary element.

Replace the secondary element at the time the primary element is cleaned for the fourth time.

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NOTICE
Always replace the secondary element. Do not attempt to reuse by cleaning.

Secondary Elements

1. Remove covers and primary elements.

2. Remove secondary elements.

3. Cover air inlet openings.

4. Clean inside of air cleaner housings.

5. Inspect precleaner tube openings for dirt.

6. If cleaning is needed, remove precleaner and clean with pressure or wash in warm water.

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When using pressure air wear safety glasses and protective clothing. Use 30 PSI (2 kg/cm2) maximum pressure air for cleaning purposes.

7. Dry and install precleaner and cap.

8. Uncover air inlet openings.

9. Install new secondary elements.

10. Install primary elements and covers.

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NOTICE
Tighten the cover bolts finger tight, to 3 lb. ft. (4 N·m). Do not use a tool to tighten them.

11. Reset filter indicator.

Cleaning Air Cleaner Elements

Pressure Air - 30 PSI (2 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. 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, air dry thoroughly and check element.

Detergent

1. Wash in warm water and nonsudsing household detergent.

2. Rinse with clean water, 40 PSI max. (3 kg/cm²), see above.

3. Air dry thoroughly and check element.

Checking Element

1. Insert light inside clean and dry element and check. Discard element if tears or rips are found.

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

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When using pressure air wear safety glasses and protective clothing. Maximum air pressure must be below 30 PSI (2 kg/cm2).

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NOTICE
Do not clean elements by bumping or tapping. Do not use elements with damaged pleats, gaskets or seals.

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

(36)Cooling System

Stop engine. Remove cap slowly to relieve pressure. Maintain coolant level 1/2 inch (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 Corrosion Inhibitor. Follow recommendations given on container.

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

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Inhibitor contains alkali, avoid contact with skin and eyes.

NOTE: If machine is to be stored in or shipped to an area with below freezing temperatures, the cooling system must be drained completely or protected to lowest expected ambient temperature.

Cleaning the Cooling System

1. The machine must be level. The bowl must be lowered. Apply the parking brake. Stop the engine.

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

3. Open radiator drain valve and allow coolant to drain.

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

5. Start engine and run for 1/2 hour. 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 slowly add coolant. See REFILL CAPACITIES.

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⁽¹⁾2 lb. Sodium Bisulphate (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.

(37)Differential And Final Drives

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NOTICE
Operate machine on level for a few minutes. Stop machine lower scraper and set parking brake.

Differential

Maintain lubricant level between ADD OIL and FULL marks on dipstick.

NOTE: If level is above FULL mark do not drain. Operate machine on level to permit lubricant level to equalize between differential and final drives. Recheck level.

Final Drives

1. Position wheels so drain plug is at bottom.

2. Maintain lubricant level to bottom of fill plug opening.

(38)Transmission System

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NOTICE
Machine level, scraper lowered, parking brake set, transmission oil warm and engine running at low idle.

Maintain oil level between ADD OIL and FULL marks on dipstick.

(39)Fuel System

Primary Filter

NOTE: Service primary element when fuel pressure gauge registers OUT with engine running.

1. Loosen nut and remove case and element.

2. Wash case and element in clean solvent.

3. Install element and case.

4. Start engine and check for leaks.

If fuel pressure gauge still registers OUT, change final fuel filter.

Final Fuel Filter

1. Remove used filter.

2. Clean filter base. Make sure all of old seal is removed.

3. Coat seal of new filter with clean diesel fuel.

4. Install new filter by hand.

5. When seal contacts base, tighten 3/4 turn more.

6. Prime system, start engine and check for leaks.

Priming Fuel System

1. Move accelerator to OFF position and open vent valves.

2. Unlock priming pump plunger and operate pump.

3. When fuel flows free of air bubbles, lock pump plunger and close vent valves.

Fuel Tank Cap

1. Remove fuel tank cap.

2. Disassemble cap and wash in clean solvent.

3. Reassemble cap and oil element lightly.

4. Install cap.

(40)Ejector Guide Rollers

1. To adjust, loosen roller shaft clamp bolt.

2. Rotate shaft to position roller.

3. Rollers are properly adjusted when ejector operates freely without dragging or binding.

4. Tighten shaft clamp bolt.

(41)Ejector Carrier Rollers

1. To adjust, loosen roller shaft clamp bolt.

2. Rotate shaft to position roller.

3. Rollers are properly adjusted when ejector operates freely without dragging or binding.

4. Tighten shaft clamp bolt.

(42)Cutting Edges

1. Block bowl and apron before changing cutting edges or routing bits.

NOTE: After removing cutting edges or routing bits, clean contact surfaces. Tighten bolts to torque values given on chart for ground engaging tools on page 37.

With two edges to each section, double wear can be obtained from each edge by rotating. Remove bolts and rotate 180°. Install bolts.

By exchanging sides, the end sections can be used four times. Remove bolts and exchange sides. Rotate 180° when necessary. Install bolts.

(43)Routing Bits

With two edges to each bit, double wear can be obtained from each bit. Remove bolts and install on opposite side. Install bolts.

(44)Ejector Channel Rollers (651)

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When moving the ejector to check roller clearances, keep personnel away from the ejector area. Stop the engine while measuring the clearances or making the adjustments.

The machine must be level, the bowl and apron lowered, the parking brake applied and the engine stopped.

Shims can be added or removed to adjust the clearance. Consult your AVSpare dealer for the correct adjustment procedure. Adjustment may require ejector removal.

Check the clearance between the rollers and the channels at several points along the channels. The ejector should operate freely and at least 1/8 in. (3.2 mm) clearance should exist anywhere along the channels.

(45)Cushion Hitch Accumulator

Check accumulator nitrogen precharge pressure when hitch cylinder has no movement or when ride becomes stiff. See your AVSpare dealer for checking procedure and pressure.

NOTE: Check accumulator nitrogen precharge pressure after first 500 service hours or 3 months to determine leak down rate. Recharge can be required in as little as 30 to 60 days.

(46)Fuel Tank

Open drain valve and allow moisture and sediment to drain. Close valve.