SANDPIPER RHDF2 Hazardous Duty - Manual (Page 19)

rhdf2dl1sm_haz duty-rev0614 Model RHDF2 Hazardous Duty Page 17
INTERMEDIATE AND AirVantage SENSOR SERVICING
• To service the intermediate and AirVantage sensor, first shut off and bleed the air being supplied to the
pump. For safety purposes, the air supply line should be disconnected from the pump. Shut off both the
suction and discharge lines to the pump. Consult the “Composite Repair Parts Drawing”.
Step #1: Remove the Patch Cable
• Twist the ribbed portion of the patch cable connector in a counterclockwise direction, until it unthreads
from the connector. The cable can either be removed from the intermediate or from the control module.
Step #2: Remove the AirVantage from the Pump
• Use a ½” socket and remove the four 5/16-18 x 5 cap screws that hold the AirVantage to the pump. Be
sure to support the weight of the AirVantage while removing the last cap screw. After the AirVantage is
removed from the pump, set the unit down on the plastic cover located on the bottom.
Step #3: Remove the Manifolds, Chambers, and Diaphragms (See Diaphragm
Servicing Section)
Step #4: Remove the Diaphragm Assemblies
• Refer to the “Diaphragm Servicing” section of the manual to remove diaphragm assembly from the
pump.
• “AirVantage CAUTION” – When the diaphragm assembly is removed, watch for the brass probe
tips located on the end of the sensor rod. There is one brass probe tip and one o-ring per
side. Inspect the probe tips and o-rings for wear. For every diaphragm service, these parts should be
replaced and are available in kit form. Consult the “Composite Repair Parts Drawing” for part numbers
and quantities.
Step #5: Remove the End Caps
• Use an Allen wrench and remove the two screws from the End Caps on either side of the intermediate.
• Use two small flat-head screw drivers to simultaneously pry the End Caps up at the ends.
• “AirVantage CAUTION” – Remove the End Caps from the intermediate with caution, taking care
not to damage the sensor. Inspect the gaskets and u-cup seals under each End Cap and replace
them as necessary.
Step #6: Accessing the Actuator Plunger Bushings and O-rings
• The actuator plunger pin bushings and o-rings can now be accessed. If it is determined that these parts
need to be replaced, use a small screwdriver and remove the retaining rings.
• NOTE: It is recommended that new retaining rings be installed after disassembly. The bushing
and o-ring can now be removed and inspected.
Step #7: Accessing the AirVantage Sensor
• If the sensor needs to be replaced, use a 13/16” socket and remove the plastic nut securing the
connector to the intermediate. Slide the connector out of the hole, taking care not to lose/misplace the
gasket on the connector.
• The sensor can now be removed from the intermediate assembly.
Step#8: Reinstallation
• Slide the new sensor assembly in the intermediate.
• “AirVantage CAUTION” – Make sure the cable assembly fits into the groove machined in the
intermediate. Failure to do so may damage the cable during assembly.
• Feed the connector through the hole in the intermediate, making sure the gasket is on the connector
before installation. The flat edge on the connector should line up with the inside of the intermediate.
Install the nut and hand tighten it using a 13/16" socket.
• The inner chambers and gaskets can now be reinstalled. Use blue thread locker on the inner chamber
bolts and torque them to 300 in-lbs.
• Refer to the “Diaphragm Servicing” section of the manual to finish the diaphragm installation procedure.
Page 17
PROBE TIP
O-RING
SENSOR, FEED BACK
WASHER, SEALING
PLATE, DIAPHRAGM
DIAPHRAGM
PAD, WEAR
PLATE,
OUTER DIAPHRAGM
CAPSCREW
SENSOR COVER
CAPSCREW
END CAP
FEED BACK SENSOR
O-RING
CAPSCREW
INTERMEDIATE
JAM NUT
O-RING
FOAM BUMPER
BEARING
SEAL
Note: Refer to Composite Repair Parts
List on page 12 for part numbers
A
BRACKET, INTERMEDIATE, ASSEMBLY SENSOR, FEEDBACK
NUT
SEAL
DIAPHRAGM
PLATE,
OUTER DIAPHRAGM
PLATE,
INNER DIAPHRAGM
PROBE TIP
O-RING
SENSOR, FEEDBACK
BUMPER
DETAIL A
FLAT EDGE