WHEEL DRIVE HY 0820626 - Caterpillar

These emissions regulated engines are equipped with tamper resistant bolts on the fuel ratio control and cover. Adjustments and repairs should be made by an authorized Caterpillar dealer.
1. Remove tube (1). Cap and plug all openings immediately.2. Remove the two bolts that hold fuel ratio control to the governor. Disconnect the fuel ratio control from the lever in the governor, and remove fuel ratio control (2).3. Remove the O-ring seal from the fuel ratio control. Remove the O-ring seals from the rear governor housing. The following steps are for installation of the fuel ratio control.4. Put the O-ring seals in position on the rear governor housing. Put the O-ring seal in position in the fuel ratio control. Put clean engine oil on the O-ring seals.5. Put fuel ratio control in position on the governor. Make sure the flange on the end of the fuel ratio control is behind the groove (slot) in the lever.6. Install the two bolts that hold the fuel ratio control to the governor. One of the two bolts that hold the fuel ratio control to the governor is a tamper resistant bolt and should be tightened until the head shears off, approximately 12 3 N m (9 2 lb ft).7. Install tube (1). For more detailed information regarding the fuel ratio control, see the topic "Fuel Ratio Control" in the Specifications Manual. See the topic "Fuel Ratio Control" in the Systems Operation Testing & Adjusting Manual for the adjustment of the fuel ratio control.Disassemble Fuel Ratio Control
Start By:a. remove fuel ratio control
These emissions regulated engines are equipped with tamper resistant bolts on the fuel ratio control and cover. Adjustments and repairs should be made by an authorized Caterpillar dealer.
1. Remove O-ring seal (1) from the fuel ratio control. 2. Put Tooling (A) in a vise as shown so that the station being used is not over the vise jaw. Place the fuel ratio control over the pins in Tooling (A). Remove cover (2) and the gasket from fuel ratio control.
There is a spring force behind cover (3). Hold cover (3) in position, and slowly remove the bolts that hold it to release the spring force.
3. Remove cover (3) from housing (4). 4. Remove O-ring seals (5) and (6) from the governor housing. 5. Remove spring (9), washer (7), and diaphragm (10) from retainer (8). Remove retainer (8) from housing (11). 6. Remove nut (16) from extension (15), and remove the extension from retainer (8). Remove valve (12), spring (13) and O-ring seal (14) from the extension. 7. Remove spring (18), retainer (17) and spring (19) from the housing. 8. Remove piston assembly (20) from the housing. 9. Use Tooling (B), and remove snap ring (21) and the wave washers from valve assembly (22). Remove piston assembly (23) from the valve assembly.10. Remove seal (24) from piston (23). 11. If necessary, remove stem (26) from valve (25).12. Clean and inspect all parts. Make a replacement of all parts that are worn or damaged.Assemble