CYLINDER HEAD GP 20R3549 - Caterpillar

Accidental machine starting can cause injury or death to personnel working on the machine.To avoid accidental machine starting, turn the battery disconnect switch to the OFF position and remove the key. If the machine is not equipped with a battery disconnect switch, disconnect the battery cables from the battery and tape the battery clamps.Place a do not operate tag at the battery disconnect switch location to inform personnel that the machine is being worked on.
It is possible for the frame of the harvester head to fall when parked in the vertical position. To avoid personal injury or death and equipment damage, fasten the safety chain to the frame and the felling link. Secure the chain in an appropriate manner.
The check valve in the saw unit can become blocked due to contamination. The lubrication oil for the saw bar will then flow out of the bar holder and the cover. The oil will be visible inside the saw box.
Table 1
Required Tool    
Part number     Part Description     Qty    
522260     Spanner Socket     1    Position the harvester head in the VERTICAL position on the ground.Install the safety device (chain) on the harvester head.Shut off all electrical power to the harvester head.Release all hydraulic pressure to the harvester head.In order to remove the check valve, you must remove the thrust plate that holds the saw bar.
Remove the saw chain and the saw bar.Reference: For information on removing the saw chain, refer to Operation and Maintenance Manual, "Saw Chain - Remove/Install".Reference: For information on removing the saw bar, refer to Operation and Maintenance Manual, "Saw Bar - Remove/Install".
Illustration 1 g00951231
Saw Unit (1) Pin. (2) Thrust plate. (3) Ball. (4) Spring. (5) Restrictor. (6) Shaft.
Remove pin (1) that holds shaft (6) with a 5-6 mm punch.
Remove the inner pin with a 5-6 mm punch.Note: Use the guide hole in order to remove the inner pin.
Remove shaft (6) and thrust plate (2) .
Unscrew restrictor (5) in the saw bar holder.
Remove ball (3) and spring (4) .
Clean ball (3), spring (4) and the passage.
Turn on the computer inside the cab for the saw. Do not start the machine. Press the button for the saw in order to flush the passage.
Turn off the computer.
Install ball (3), spring (4) and restrictor (5) in the saw bar holder.
Turn on the computer inside the cab for the saw. Do not start the machine. Press the button for the saw. Check that the oil is flowing out of restrictor (5).
Turn off the computer.
Assemble all part in the opposite way.
Install the saw bar and the saw chain.