Service
Air Valve Service
NOTE: Service the air valve every 3 million cycles. If the air motor stalls, service the air valve immediately.
NOTE: Air Valve Repair Kit 222959 is available. Parts included in the kit are marked with a symbol ({). For the best results, use all the parts in the kit.
NOTE: Trip Rod Kit 222981 and Detent Kit 222982 are available to replace these complete assemblies. Parts included in Kit 222981 are marked with a symbol (}) and parts included in Kit 222982 are marked with a checkmark (n).
Disassembly
2.Remove the air motor shroud as described under
Air Motor Shroud Disassembly, on page 11.
3.Follow steps 3 and 4 under Air Valve Replace- ment on page 11.
4.Using a 4 mm allen wrench, remove the socket screws (104) holding the two slide plates (124) to the valve housing (101). Lift the slide plates off the housing, being careful not to scratch the polished surfaces. Clean the slide plate surfaces and edges and inspect for damage. See Fig. 4.
5.Lift the valve carriage (111) out of the valve hous- ing (101). The detent assemblies (J) will slide out of the carriage; be careful not to drop them. Set them aside.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 10.
1.Stop the pump at the middle of its stroke. Relieve the pressure before performing any service.
6.Remove the screws (104) holding the top rod fitting (103) to the valve housing (101). Turn the fitting 90_ and remove it. Using an
7.Remove the trip rod assembly (T) from the hous- ing (101). Set it aside.
Jn
4 2 104
124
111
1 Lubricate.
2Apply thread sealant.
3 | Grease ends of trip rod (T). | }107 |
| |
104 5 | 2 | |||
|
|
4Torque to 9 NSm (75
3 | 104 | 2 | 5 |
103} 1
102} 1 6
101
5Torque to
6Lips must face into housing (101).
}These parts are included in Trip Rod Kit 222981, which may be purchased separately.
nThese parts are included in Detent Kit 222982, which may be purchased separately.
}T 
3
102} 1 6
103} 1
104 2 5
02271
Fig. 4
308213 13