Wilkerson ER2 - Manual (Page 5)

!
Maintenance
1. DEPRESSURIZE THE AIR LINE PRIOR TO ATTEMPTING ANY
SERVICE TO THE UNIT! IT IS ALSO RECOMMENDED THAT
POWER TO THE UNIT BE DISCONNECTED PRIOR TO SERVICING.
2. Main Valve: Remove bottom plug, valve assembly and valve spring.
Inspect all the seals and components for damage and replace as
required. Clean all seals and components with soft cloth and lightly
lubricate the valve O-ring, bottom plug O-ring and valve stem with
MAGNALUBE-G lubricant and reassemble in reverse order.
3. LCD Display: Remove the two screws from the LCD cover and
carefully remove the cover. Turning the cover over, remove the two
screws inside that retain the LCD board to the cover and lift out the
LCD board. Unplug the display board from the ribbon cable. If
defective replace with a new LCD board and re-connect the ribbon
cable. Making sure the LCD lens and seal are in place, replace the
LCD board in the cap and secure with the two screws. Replace the
cover back on the unit and secure with the two screws.
4. Control Board: If unit is an LCD type, remove the LCD display
board from the cap as described in step #3 and unplug the ribbon
cable from the LCD board. Now unscrew the three screws that retain
the control board housing and unplug the valves from the back of the
control board. Carefully lift the housing with the control board still
inside. Remove the control board from the bottom of the housing and
replace with the new control board. Reassemble in reverse order.
5. Valve Replacement: The electronic valves cannot be serviced
internally. If failure occurs, replace the valve. To replace the valves,
remove the housing as described in step #4 above. Once the housing
is removed, unscrew the defective valve from the cap. Making sure to
replace with correct valve [3 position connector for intake valve and 2
position connector for the exhaust valve
(Figure 6)], screw the valve
down until it seals on the base of the valve seal. Reassemble the
control board and cap as described in steps #3 and #4.
6. Diaphragm, Mid-plate and Regulator Cap: Remove the control
board and housing as described in step #4 and remove the exhaust
valve. Now remove the two screws that secure the cap to the
regulator body. Lift the cap from the body. Remove the upper and
lower diaphragms, noting which one is upper and lower, from the
mid-plate. Examine the diaphragms and relief seat in the lower
diaphragm for wear and tears and replace as required. Replace the
filter in the mid plate. Clean all surfaces and components with a soft
cloth and reassemble in reverse order.
NOTE: Any time the mid-plate is removed, replace the internal
filters (see exploded view for locations). One is in the cap
for the exhaust, one is in the mid-plate for the intake.
Figure 6
Intake Valve
Exhaust Valve