Service Procedures; Exhaust Silencer Replacement; Dust Filter Element Change; Oxygen Sensor Replacement - Parker MAXIGAS serie Handbuch

5.4 Service Procedures

Ensure that the generator is isolated from the mains power supply and fully depressurised before carrying out any of
the following service procedures.

5.4.1 Exhaust Silencer Replacement

The exhaust silencer is located under the inlet manifold assembly. Unscrew the silencer assembly from the exhaust flange plate and
remove. Slide the silencer element off the baffle (A) and replace.
Ensure that the replacement element is inserted into the groove of the baffle end cap and screw the exhaust silencer assembly back into
the exhaust flange plate.
When fitted correctly there should be no movement of the element on the baffle.

5.4.2 Dust Filter Element Change

Close the ball valves located on the inlet and outlet ports of the filter and de-pressurise it by opening the drain valve on filter bowl.
Once de-pressurised unscrew the filter bowl from the head (D) and remove the old filter element. Holding the replacement element by the
end caps, fit it into the bowl ensuring that the element is correctly seated (E).
Assemble the filter bowl back onto the filter and tighten. The markers on the filter head and filter bowl must line up with each other when
fully assembled (F).
Close the drain valve on the filter and slowly open the filter outlet valve and inlet valve.

5.4.3 Oxygen Sensor Replacement

Disconnect the O cell lead from the O2 analyser. Terminals 1, 2 and 3 (% vol O
2
Unscrew the tube nut holding the O
Fit the replacement sensor onto the t-piece and perform a leak test. All leaks must be repaired.
Refit the electrical connections to the O
.
Terminal Colour
1 Blue
2 Red
3 Green
4 Blue
5 Red
Calibrate the sensor as detailed in section 4.7 (Note: PPM cells require the offset value to be entered prior to calibrating)
cell in place and remove the cell (C).
2
analyser
2
Function
-ve % vol sensor
+ve % vol sensor
Ground
-ve ppm vol sensor
+ve ppm vol sensor
cells) or 3, 4 and 5 (ppm vol O
2
19
EN Servicing
cells) (B)
2