Page 9 of 13
Maintenance
1. Before dismantling the unit, exhaust the air in the line completely.
2. Dismantle the components and clean them in kerosene and blow with compressed air.
3. Check for damages in the O-rings (15), (16.1), (17) and at sealing areas in the valve cone
rubber, spherical relieving seating, seating area of the housing, etc. Replace if needed or
clean and reassemble.
4. For assembly of the unit: Apply general purpose grease on the O-rings (15), (16.1), (17) and
on the cylindrical surface of the valve cone (13), on threads of the adjusting screw (7), and on
bearing washer (6). Reassemble all the components.
Troubleshooting
Use the table below to troubleshoot problems before contacting service personnel or your local
dealer. If the problem continues after troubleshooting, call your local dealer for assistance.
Failure
Possible Cause
Corrective Action
Continuous leak through the
knob (1).
Diaphragm (9) damaged.
Replace Diaphragm assembly (9).
Relieving spherical seating
of the valve cone damaged.
Replace valve cone assembly (13).
Dirt found in between the
seating and the valve cone
(13).
Clean and reassemble.
O-ring (16.1) damaged.
Replace the o-ring (16.1).
Air leaks through housing
and bottom plug (16)
interface.
O-ring (15) damaged.
Replace the o-ring (15).
Setting pressure goes on
increasing slowly.
Relieving spherical seat of
the valve cone damaged.
Replace the valve cone assembly (13).
Dirt found in between the
seating and the valve cone.
Clean and reassemble.
O-ring (16.1) damaged.
Replace the o-ring (16.1).
After frequent use of
adjustment knob, the
pressure setting
becomes
impossible.
Wearing out of the adjusting
Screw (7).
Replace the adjusting screw assembly
and apply general purpose grease on
threads and at washer (6).
Supply pressure directly
connected to outlet
port and making
pressure setting
impossible.
Valve cone assembly (13)
is stuck.
Dismantle the valve assembly (13).
Clean using kerosene and air jet.
Reassemble after applying general
purpose grease on o-ring (17) and on
the valve cone cylindrical portion.
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