MAINTENANCE
36
9/230, 9/270, 9/300, 12/235, 17/235, 21/215, 9/230HA, 9/270HA, 9/300HA, 12/235HA, 17/235HA, 21/215HA
17/235 21/215 XHP750
KEY
1
Air cylinder
7
Regulation pressure transducer
13
Pressure transducer
2
Butterfly valve
8
Start/Run solenoid
14
Minimum pressure valve
3
Mini compressor
9
Pressure regulator
15
Separator tank
4
Unloader Solenoid
10
Panel pressure guage
16
Auto blowdown valve
5
Relief valve
11
Manual blowdown valve
17
HR2 Airend
6
Orifice
12
Temperature sensor
18
Air inlet
SPEED AND PRESSURE REGULATION ADJUSTMENT
17/235 21/215 RHP750
Normally, regulation requires no adjusting, but if correct adjustment
is lost, proceed as follows:
Refer to the diagram above.
With the unit stopped, disconnect ballast spring ‘A’ from the butterfly
lever. Loosen the two screws securing bracket ‘C’ to main bracket ‘J‘.
Loosen screw ‘D‘ and rotate the butterfly valve pivot shaft ‘K‘ fully
clockwise until the valve is closed. Position lever ‘L‘ approximately 10
°
after vertical and tighten screw ‘D‘.
Keep the butterfly lever in the closed position and with the the air
cylinder fully contracted tighten the screws holding bracket ‘C’ to the
main bracket ‘J‘.
Allow the cylinder to return to its extended position and reconnect
the ballast spring ‘A‘.
IMPORTANT: Ensure all components are aligned and move freely.
Start engine: Note receiver pressure. Warm up pressure should be
3,5–5,0 bar (50–70 p.s.i.).
To increase the warm up pressure, turn the air cylinder rod in an
anti–clockwise direction to open the butterfly valve.
To reduce warm up pressure, turn air cylinder rod in clockwise
direction to close butterfly valve.
When the engine is warmed up, press the service air switch on
the control panel to commence normal regulation.
Set pressure by adjusting the screw ‘E’ on the pressure regulator
‘F’. Turn the screw clockwise to increase pressure and anticlocwise to
reduce pressure.