CAMSHAFT AND CAMSHAFT GEAR

COMPENSA TOR ROO

GOVERNOR ARM

figure 69-Governor Clnd Control Linkage Adju$tments

8. If working on a row crop tractor, move the pedestal into place and tighten the attaching holts.

9. Install the radiator upper and the lower hose.

10. Fill the radiator with coolant and check for leaks.

11. Adjust the governor linkage as detailed below.

F. Setting Governed Engine Speed

1. Before attempting to set the engine governed speed, make certain that the governor and carburetor throttle lever are in the full open position.

This can be checked by disconnecting the throttle rod at the carburetor and moving the hand throttle lever to the full open position. If the throttle rod cannot be connected to the carburetor without moving the governor lever, the linkage must be adjusted. 2. To adjust the linkage, loosen the locknut at the carburetor rod clevis, as shown in Figure 69.

With the hand throttle and carburetor lever in fun open position, lengthen or shorten the rod as necessary to connect it to the throttle lever.

Tighten the lock nut.

3. With the engine at normal operating temperature, set the idle speed to 450-475 rpm.

4. At this rpm, the governor arm should be contacting the end of the compensator rod with a minimum of spring tension. Adjust the < compensator spring as required.

S. With the engine running under no load, open the hand throttle to the wide open position. If the engine rpm registers 2200 rpm on Series 501 through 70l tractors or 2400 rpm on Series BOO through 901 tractors, the governor is properly set. To adjust the linkage for the recommended speed, loosen the lock nut on the maximum speed adjustment stop, Figure 69, Start the engine and set the hand throttle until the Proof-

Meter registers the correct rpm for the model being checked, then slide the maximum speed adjustment stop against the stop bracket on the cylinder block. Tighten the maximum speed adjustment stop lock nut.

6. If the throttle has a tendency to creeP. remove the cotter pin from the castellated nut on the bellcrank, Figure 69, Tighten the nut as required to increase the spring tension. Install the cotter pin.

The camshaft cannot be removed with the engine in the tractor. If the front of the camshaft is provided with a tapped hole, as they were on earlier models, it is possible to remove the camshaft gear after the cylinder front cover and governor have been removed.

Later model engines are provided with a snap ring instead of a bolt to retain the gear after it has been pressed on the shaft. The procedure for camshaft gear replacement will be after the camshaft has been removed from the engine. A. Camshaft Removal

1. Remove the engine from the tractor and mount it in an engine stand.

2. Remove the cylinder front cover, governor or sleeve and slinger on diesel engines.

3. Remove the flywheel and engine rear plate.

4. Remove the hydraulic pump drive gear cover, gasket and the pump drive gear from the rear of the camshaft. Figure 70.

Figure TO-Hydraulic Pump Drive Gear and Related Parts

5. Remove the rocker arm cover. Loosen the tappet adjusting screws and carefully remove the push rods.

6. Invert the engine so that the tappets will fall away from the camshaft.

7. Pull the camshaft gear away from the cylinder block as far as possible. Check the clearance between the hub of the camshaft gear and the thrust plate with a feeler gauge, as shown in Figure 71. If the clearance exceeds 0.007", replace the thrust plate before reassembly.

8. Remove the two cap screws that attach the thrust plate to the cylinder block, as shown in

Figure 72.

9. Carefully withdraw the camshaft from the cylinder block, being careful that the sharp edges of the cam lobes do not damage the cam bearing bores.

to. Remove the snap ring or bolt and washer from the front of the camsbaft. Carefully press the camshaft out of the gear. Remove the Woodruff key from the camshaft.

B. Inspection

1. Visually inspect the camshaft journals and lobes for roughness, scores, nicks, pits or discoloration from heat Inspect the distributor or fuel injection pump drive gear for worn or broken teeth. Replace the camshaft if any of these defects are evident

2. Measure the diameter of the bearing journals and replace the shaft if less than 1.9245" or if

Figure 71-Chec:king Camshaft End Play Figure 72-Removing Camshaft Thrust Plate Attaching Screws