LIFT GP 3C8643 - Caterpillar

Illustration 1 g01294710
Typical examples of air shutoff valves (1) Butterfly / throttle blade style (2) Swing gate style (3) New switch location (4) 289-8498 Damper
Illustration 2 g01201688
Old switch location (typical example)The new air shutoff valves are for all 3500B and 3500C Engines that are equipped with two, swing gate type air shutoff valves. This change does not affect engines with the following equipment.
Two butterfly valve (1) air shutoff valves
Single air shutoff valveFor engines that are equipped with two butterfly valve (1) air shutoff valves, contact the dealer in order to upgrade to the swing gate (2) air shutoff valve.Improved air shutoff valves that include the updated switch assembly are available. The improved assemblies also include a vibration damper (4). The purpose of the vibration damper is to reduce the vibration of the gate. The gate has also been chamfered in order to minimize the wear of the housing. The vibration damper is applicable to engines that are equipped with the new part numbers that are listed below. Refer to Table 2.Refer to Special Instruction, REHS2814 for information. This Special Instruction provides information on upgrading the valves.
Table 1
Part Numbers for the Air Shutoff Valves    
Former Air Shutoff Gp     New Air Shutoff Gp    
225-7836 (1)
272-7092     288-2756    
225-7837 (1)
272-7093     288-2757    
230-6305 (1)
272-7094     288-2758    
230-6306 (1)
272-7095     288-2759    
230-6307 (1)
272-7096     288-2760    
230-6308 (1)
272-7097     288-2761    
233-7873 (1)
272-7100     289-9117    
233-7874 (1)
272-7101     289-9118    
230-6309 (2)
272-7098     288-2762    
230-6310 (2)
272-7099     288-2763    
    288-2764    
    288-2765    
( 1 ) Cancelled part number
( 2 ) This part number has not been cancelled.The 289-8498 Damper is serviceable. Refer to Table 2. The new air shutoff valves include the relocated limit switches and the vibration dampers.
Illustration 3 g01294099
Typical example (4) 289-8498 Damper
Illustration 4 g01294119
Typical example
Table 2
Parts for the 289-8498 Damper    
Item     Part Number     Description    
5     288-2766     Housing    
6     288-2767     Spring    
7     288-2768     Plunger    
8     3J-1907     O-Ring Seal    
9     9S-8004     Plug     The air shutoff valves must be tested after every 500 hours of operation. The vibration damper assembly must be serviced after every 6000 hours of operation. Refer to Special Instruction, REHS3005 for the inspection and maintenance instructions for the damper.