NO. 16 MOTOR GRADER When Required Caterpillar

When Required
1.1. (62)Engine Air Intake System
2.2. Servicing Primary Element:
3.2. Servicing Secondary Element:
4.2. Cleaning Air Cleaner Elements
5.2. Checking Element
6.1. (63)Cooling System
7.2. Cleaning the Cooling System
8.1. (64)Fuel System Filters
9.2. Primary Fuel Filter
10.2. Final Fuel Filters
11.2. Priming The Fuel System
12.1. (65)Circle Shoes
13.2. Check Circle to Drawbar Clearance
14.2. To Adjust:
15.2. Check Circle to Shoe Clearance
16.2. To Adjust - Front Shoes
17.2. Rear Shoes
18.2. To Replace Shoes
19.1. (66)Center Shift Rack
20.1. (67)Center Shift Control Pinion
21.1. (68)Ball And Socket Joints
22.2. Check Adjustment
23.1. (69)Parking Brake
24.1. (70)Cutting Edge And End Bits
25.2. Cutting Edge
26.2. End Bits
27.1. (71)Fuel Tank Filler Strainer
28.1. (72)Ripper-Scarifier Shanks
29.2. Ripper Shank
30.2. Scarifier Shank
31.1. (73)Brake Accumulator
32.1. (74)Blade Lift Drive Housing
33.1. (75)Circle Center Shift Gear
34.2. Housing
35.1. (76)Steering Gear Housing
36.1. (77)Circle Transfer Gear Housing
37.1. (78)Circle Drive Housing
38.1. (79)Tandem Drive Housings

(62)Engine Air Intake System

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

Never service air cleaner with engine running.


Service filter element when RED indicator locks in the visible position.

Servicing Primary Element:

1. Remove cover and primary element.

2. Clean inside of body and cover.
3. Clean and inspect element. (See Page 32.)


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

4. Install clean element and cover.
5. Reset indicator.

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


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

Servicing Secondary Element:

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

2. Cover air inlet opening and clean air cleaner body and precleaner.
3. Uncover air inlet.
4. Install new secondary element. Torque nuts to 30 ± 5 lb. ft. (2.8 ± .69 mkg).
5. Install clean primary element.
6. Install covers.
7. Reset 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.


1. Wash in warm water and non-sudsing household detergent.
2. Rinse with clean water, 40 PSI maximum (3 kg/cm2), see above.
3. Air dry thoroughly and check.

Checking Element

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

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

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

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



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.

(63)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 Corrosion Inhibitor. Follow recommendations given on container.

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

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

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. Run engine until water temperature gauge registers NORMAL. Park motor grader 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 system 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.

(1)2 lb. (1 kilo) Sodium Bisulfate (NaHSO4) per 10 gal. (40 ltr) water.

(2)1/2 lb. (250 g) Sodium Carbonate Crystals (Na2CO3. 10 H2O) per 10 gal. (40 ltr. water).

NOTE: Most commercial cooling system cleaners may be used.

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

Use all cleaning solutions with care.


(64)Fuel System Filters

Primary Fuel Filter

1. Close fuel supply valve.

2. Loosen nut and remove case element.

3. Wash element and inside of case.

4. Insert element in case and install case and element.

5. Open fuel supply valve. Start engine and check for leaks.

Change final fuel filters if fuel pressure gauge registers OUT with engine running.

Final Fuel Filters

1. Close fuel supply valve and remove filters.

2. Clean gasket surfaces of filter base.

3. Lubricate gaskets of new filters with diesel fuel.

4. Install filters. Tighten until gasket surface contacts base, then tighten 1/2 additional turn.

5. Open fuel supply valve and prime fuel system (see below).
6. Start engine and check for fuel leaks.

Priming The Fuel System

1. Open system vent valve.

2. Unlock priming pump plunger.

3. Operate pump plunger.

4. Stop when fuel flow is free of bubbles.

5. Close vent valve.

6. Lock priming pump plunger.

(65)Circle Shoes

Check Circle to Drawbar Clearance

1. Park on level ground. Raise blade approximately 4 inches (10 cm) and angle it at 90° to machine frame.

2. Set blade and circle level with ground. Make sure guide shoes (through fittings) and top of circle are lubricated.

3. Make sure that the bolts holding shoes to drawbar are tight.

4. Measure between bottom of each wear plate and top of circle. Distance should be .010 inch (0,25 mm) to .060 inch (1,52 mm). Turn circle 360°, stopping at 90° intervals. Check clearance at each interval.

To Adjust:

1. Adjust one shoe at a time. Loosen shoe mounting bolt.

2. Remove shims to bring to approximately .010 inch (0,25 mm). Shims are 0.10 inch (0,25 mm) and .030 (0,76 mm) thick.

3. Tighten bolts and recheck clearance. Repeat complete check procedure after all shoes are adjusted.

Check Circle to Shoe Clearance

1. Park on level ground. Set blade at 90° to machine frame and lower blade to ground and apply slight down pressure.

2. Inch machine forward and apply parking brake to hold a light load on blade.

3. Measure distance between bottom flange of pinion and inner machined surface of circle. Distance should be 1.90 inches (48,3 mm) to 1.92 inches (48,8 mm).

4. If distance is incorrect, adjust front shoes (see page 38).

5. Check clearance between toe of each rear shoe and circle, when front shoe adjustment is correct. Distance should be approximately .030 inches (0,76 mm). Adjust if necessary.

6. Check clearance between toe of each intermediate shoe and circle. Distance should be approximately .030 inches (0,76 mm). If measurement is over .060 inches (1,52 mm), replace shoes.

To Adjust - Front Shoes

1. Adjust front shoes first. Loosen mounting bolts of front and rear shoes.

2. Loosen front shoe adjusting screw locknuts. Front shoes must be adjusted uniformly.

3. Turn adjusting screws in or out to obtain 1.90 inch (48,3 mm) between pinion and circle.

4. Tighten setscrew locknuts and shoe mounting bolts.

5. Check distance. If shoes are worn to point that correct distance cannot be obtained, use new shoes.

Rear Shoes

1. Loosen rear shoe mounting bolts and adjusting screw locknuts.

2. Turn adjusting screws in or out to obtain .030 inch (0,76 mm) clearance between toe of shoe and circle.

3. Tighten locknuts and mounting bolts.

4. Check clearance. If correct clearance cannot be obtained, use new shoes.

To Replace Shoes

1. Loosen setscrew locknuts and setscrews.

2. Remove mounting bolts and washers.

3. Remove shoe and shims.

4. Install new shoe without shims and tighten bolts.

5. Measure gap between top of shoe and bottom of circle.

6. Loosen mounting bolts.

7. Install shims equal in thickness to measured gap, plus .060 inch (1,52 mm).

8. Tighten mounting bolts.

9. Check adjustment, according to location, and adjust vertically and horizontally.

(66)Center Shift Rack

1. Check clearance between rack and rail. Clearance at tightest point should be .010 to .030 inch (0,25 to 0,77 mm). Set rack so 1 inch (25,4 mm) of rail shows at right of rack.

2. Remove center shift link pin and pry rack away from pinion.

3. Check clearance right front half of rack and rail.

4. Set rack so 1 inch (25 mm) of rail shows at left of rack.

5. Check clearance between left front half of rack and rail.

6. Run rack to right. Leave at least 3 teeth showing at left of pinion.

7. Check clearance between left front of rack and rail.

8. Run rack to left. Leave at least 3 teeth showing at right of pinion.

9. Check clearance between right front of rack and rail.

10. Remove shims from between rack halves to adjust. Three sets of .010 and .015 inch (0,254 and 0,381 mm) shims are spaced along rack. Loosen rack bolts and ball studs.

11. Remove equal thickness of shims from each set.

12. Tighten bolts and ball studs.

13. Check clearances.

(67)Center Shift Control Pinion

1. Backlash should be no more than .030 inch (0,762 mm) at any point.

2. Check backlash with rack centered, rack run full right and rack run full left. See your AVSpare dealer for adjustment procedure.

(68)Ball And Socket Joints

Check Adjustment

1. Stop machine and lower blade. Leave engine running.

2. Operate blade lift and then center shift controls while observing linkage and ball joints. If play is present at ball joints, adjust.

To 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 in thickness to gap, less .003 to .008 inch (0,08 to 0,20 mm).

(69)Parking Brake

Adjust Handle Knob:

1. A firm pull should be required to snap handle over into engaged position.

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


1. With brake released, tighten knob and then back off 4 full turns.

2. Loosen linkage clevis locknut.

3. Remove cotter pin and pin from clevis. Screw clevis 4 turns onto rod.

4. Install clevis with pin and cotter pin. Tighten locknut.

5. Complete adjustment with handle knob. Check adjustment.

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

(70)Cutting Edge And End Bits

Cutting Edge

1. Lower moldboard onto blocks. Stop engine.

2. Loosen end bit bolts and remove cutting edge bolts.

3. Remove cutting edge.

4. Install new cutting edge. Use new bolts if old ones are damaged.

End Bits

1. Remove end bit bolts. Remove end bit.

2. Install new narrow end bits if old ones are worn or damaged.
3. Install new end bits. Use new bolts if old ones are damaged.

(71)Fuel Tank Filler Strainer

1. Remove strainer retaining snap ring. Remove strainer.

2. Clean strainer in clean solvent. Install strainer and snap ring.

(72)Ripper-Scarifier Shanks

Ripper Shank

1. Replace tip before it wears back to shank. Drive out retaining pin.

2. Slide tip off.

3. Check plug. Install new plug if damaged. Metal part of plug must be toward pin hole.

4. Install tip in either digger (left) or runner position (right).

5. Align pin holes of shank and tip and install pin.

Scarifier Shank

1. Drive tip off shank.

2. Install tip in either digger (left) or runner position (right).

3. Drive tip securely onto shank.

(73)Brake Accumulator

Accumulator is located on right side, behind operator's compartment. Check nitrogen precharge pressure. Your AVSpare dealer is equipped to make this check.

(74)Blade Lift Drive Housing

Check oil at fill plug openings. One housing each side. Maintain level to bottom of opening.

(75)Circle Center Shift Gear


Check oil at fill plug opening. Maintain level to bottom of opening.

(76)Steering Gear Housing

1. Remove steering gear housing cover.

2. Maintain oil level 1/2 inch (12 mm) below filler opening.

(77)Circle Transfer Gear Housing

Maintain oil level to bottom of fill plug.

(78)Circle Drive Housing

Maintain oil level to bottom of fill plug.

(79)Tandem Drive Housings

1. Check oil level on level gauge in each housing.

2. Oil should be to FULL mark. Add oil through gauge opening, if required.