SANDPIPER RHDB2 Hazardous Duty - Manual (Page 22)

rhdb2dl1sm_haz duty-rev0614 Model RHDB2 Hazardous Duty Page 20
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 5½ 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, carefully set the unit down on the plastic cover located on the
bottom.
STEP #3: Remove the Pilot Valve
• Remove the main air distribution valve body from the pump.
• Lift the pilot valve body out of the intermediate housing. (Most problems with the pilot valve can be
corrected by replacing the o-rings.)
STEP #4: Dissasemble the Pilot Valve
• Remove the pilot spool and wipe it clean. Inspect the spool and o-rings for dirt, cuts or wear.
Replace parts if necessary.
• Use a set of outside snap ring pliers and remove the retaining ring holding the sleeve in the pilot
valve body.
• Gently push the sleeve from the body and wipe it clean. Inspect the sleeve and o-rings.
• Replace parts if necessary
STEP #5: Inspect the Actuator Plungers
• Remove the plungers by sliding them out of the bushings. It may be necessary to use a fine piece of
wire to pull them out.
STEP #6: Reassemble the Pilot Valve
• Generously lubricate the o-rings on the pilot sleeve with multipurpose grease (BP-LSEP-2 or
equivalent).
• Carefully insert the sleeve in the pilot valve body on the chamfered side, taking care not to shear any
of the o-rings.
• Securely insert the retaining ring around the sleeve.
• Generously lubricate the o-rings on the pilot spool. Carefully insert the spool in the sleeve.
STEP #7: Reinstall the Pilot Valve
• Push both plungers (located inside the intermediate bracket) out of the path of the pilot valve spool
ends to avoid damage.
• If the pilot valve does not fit flush against the gasket, check to make sure the actuator plunger are pushed
all the way. Failure to do so may cause damage to the pilot valve or the actuators.
• Insert the pilot valve body onto the intermediate housing.
• Reinstall the main air distribution valve body onto the pump.
Step #8: Reassemble AirVantage and Cable
• Reinstall the AirVantage using the four 5/16-18 x 5½ cap screws and torque to 90 in-lbs.
• Reattach the patch cable connector that connects the AirVantage module to the intermediate.
Pilot Valve and Actuator Plunger Servicing
Note: Refer to Composite Repair
Parts List on page 12 for part
numbers
15
1
29
4.F
4.A
4.B
4.D
49
35
10
28
4.C
4.E
5
Item Part Number Description Qty
4.A 095.070.558 BODY, Pilot VALVE 1
4.B 755.025.162 SLEEVE, Pilot VALVE 1
4.C 560.033.360 O-RING 4
4.D 775.026.115 SPOOL, Pilot VALVE 1
4.E 560.023.360 O-RING 2
4.F 675.037.080 RING, RETAINING 1