NO. 112, 120 & 140 MOTOR GRADERS Every 2000 Service Hours Or 1 Year Caterpillar

(45)Transmission And Rear Axle Housing - Change Oil

1. Remove drain plug and allow to drain. Change filter element (see item 37).

2. Remove fill plug. Clean and install drain plug.

3. Fill to bottom of filler opening. (Refill capacity on page 45.) Clean and install fill plug.

(46)Power Control Housing - Change Oil

1. Remove drain plug and allow oil to drain.

2. Remove filler opening plug. Clean and install drain plug.

3. Remove level plug.

4. Fill to bottom of level plug opening. Clean and install plugs.

(47)Power Control Worm And Gear

1. Remove drain from housing below operator's compartment. Allow to drain. Clean and install plug.

2. Fill through filler opening near clutch pedal. Fill until oil is visible in filler elbow.

(48)Blade Lift Housings - Change Oil

1. Remove drain plug from 1 housing each side. Allow to drain. Clean and install plug.

2. Remove level and fill plugs. Fill to bottom of level opening. Clean and install plugs.

(49)Center Shift Housing - Change Oil

1. Remove drain plug and allow to drain. Clean and install plug.

2. Fill to bottom of filler opening. Clean and install plug.

(50)Circle Reverse Housing - Change Oil

1. Remove drain plug and allow to drain. Clean plug and install.

2. Remove fill plug and fill to bottom of filler opening. Clean and install plug.

(51)Tandem Housings - Change Oil

1. Remove 1 drain plug from each side. Allow to drain. Clean and install plugs.

2. Remove level plug in side of housings.

3. Fill through top access plates. Fill to bottom of level plug (refill capacity on page 44). Clean and install plugs and plates.

140 Only

1. Remove 1 drain plug from each side. Allow to drain.

2. Install drain plugs and remove combination level gauge and filler Cap.

3. Fill to FULL mark on gauge. Install gauge and cap (refill capacity on Page 44).

(52)Front Wheel Bearings - Repack and Adjust

1. Raise front wheels and block under axle.

2. Remove hub cap bolts and cap.

3. Remove cotter pin from locking pin and remove pin.

4. Remove axle nut.

5. Remove washer.

6. Slide wheel out and back to free outer bearing. Remove washer and bearing.

7. Remove wheel from axle. Use a sling and hoist.

8. Clean axle and inner bearings. Inspect bearing.

9. Clean wheel bearing, washer, pin and nut. Inspect bearings.

10. Clean bearing surfaces and cavity of wheel.

11. Pack wheel bearings with grease. Work grease in around bearing rollers.

12. Inspect grease seal. Use new one if necessary.

13. Inspect nut to make certain threads are in good condition.

14. Install wheel on axle.

15. Install bearing. Make sure bearing has plenty of grease.

16. Install washer and nut.

17. Tighten nut until wheel seizes when turned by hand.

18. Back nut off 1/6 turn. Make sure wheel turns freely.

19. Install nut locking pin and cotter pin. Make sure wheel still turns freely. Install hub cap.

(53)Circle Drawbar Ball And Socket - Adjust

1. Raise blade off ground and pry drawbar forward as far as possible.

2. Measure clearance between drawbar ball and cap. Clearance should not be over .062 inch (1,57 mm).

3. To adjust, remove cap bolts and slide cap back.

4. Cut shim or shims, as required, and remove.

5. Install and tighten cap bolts.

6. Check clearance. Repeat steps 3, 4 and 5 if clearance is over .062 inch (1,57 mm).

(54)Flywheel Clutch - Adjust

1. Maintain clutch pedal travel of 1-7/8 inch (47 mm) to 2 inch (50 mm).

2. Adjust clearance between clutch levers and release bearing thrust ring to maintain free travel.

3. Remove clutch housing inspection hole cover bolts.

4. Remove cover.

5. Remove cotter pins from adjusting nuts and screws.

6. Turn each adjusting nut in (clockwise) until levers tough thrust ring.

7. Back nut off to obtain .12 ± .02 (3,0 ± 0,5 mm).

8. Check clearance between levers and ring. All levers must have same clearance.

9. Check pedal free play. Install cotter pins in nuts and screws. Install cover.

(55)Engine Valve Lash - Check and Adjust

Check valve lash when engine is stopped. No. 112 will have valve No's 1 through 4.

1. Remove rocker arm covers. Check valve lash and adjust if necessary (See page 31).

2. Remove plug from flywheel housing. Turn flywheel to close No. 1 inlet and exhaust valves and allow timing bolt to be inserted. Turn engine slowly when installing bolt. Do not use starting motor.

3. No. 120 & 140: Check lash at No. 1, No. 2 and No. 4 inlet valves. Check lash of No. 1, No. 3 and No. 5 exhaust valves.

No. 112: Check lash of No. 1 and No. 2 inlet valves. Check lash of No. 1 and No. 3 exhaust valves.

Adjust valves if necessary (See page 31).

4. Remove bolt and turn flywheel 360° to close No. 6 exhaust and inlet valves of the No. 120 & 140 or No. 4 valves of No. 112. Insert bolt.

5. No. 120 & 140: Check lash of No. 3, No. 5 and No. 6 inlet valves. Check lash of No. 2, No. 4 and No. 6 exhaust valves.

No. 112: Check lash of No. 3 and No. 4 inlet valves. Check lash of No. 2 and No. 4 exhaust valves.

Adjust valves if necessary.

6. Remove bolt from flywheel and install plug in flywheel housing.

7. Start engine and run at low idle. Check valve rotators. If valves do not rotate, see your AVSpare dealer.

8. Stop engine and install valve cover. Tighten bolts to 6 to 10 lb. ft. (0,83 to 1,39 mkg), in sequence shown. DO NOT overtighten.

To Adjust Valve Lash:

1. Loosen adjusting screw locknut.

2. Turn adjusting screw in to close gap, out to open gap (see page 29 for correct lash).

3. Hold adjusting screw with screwdriver and tighten locknut.

4. Recheck adjustment.

5. Remove bolt from flywheel and install plug in flywheel housing.

6. Install rocker arm cover (see page 30 for correct bolt tightening sequence and torque).