SANDPIPER RHDB2 Metallic - Manual (Page 20)

rhdb2dl1sm-rev0614 Model RHDB2 Page 18
Air Valve Servicing, Assembly Drawing & Parts List
Read these instructions
completely, before
i n s t a l l a t i o n a n d
start-up. It is the
responsibility of the
purchaser to retain this
manual for reference. Failure to comply
with the recommendations stated in this
manual will damage the pump, and void
factory warranty.
IMPORTANT
AIR VALVE ASSEMBLY PARTS LIST
Item Part Number Description Qty
1 031-183-003 Air Valve Assembly 1
1-A 031.012.162 Sleeve and Spool Set 1
1-B 095.043.156 Description 1
1-C 132-014.358 Bumper, Air Valve 2
1-D 165.011.157 Cap, End 2
1-E 170.032.330 Capscrew, Hex Head 1/4-20 x 3/4 8
1-F 360.010.427 Body, Air Valve 2
1-F 560.020.360 O-ring 6
1.B
1.A 1.A
1.C
1.F
1.D
1.E
1.F
1.C
1.F
1.D
Note to Trent: Do not paste this table in S/M. Only use to modify on
on page 18
Page 18
ITEM
NO.
PART NUMBER DESCRIPTION QTY.
1.A 031.012.162 SLEEVE & SPOOL SET 1
1.B 095.043.156 DESCRIPTION 1
1.C 132.014.358 BUMBER, AIR VALVE 2
1.D 165.011.157 CAP, END 2
1.E 170.032.330 CAPSCREW, HEX HEAD 1/4-20 X 3/4 8
1.F 360.010.427 BODY, AIR VALVE 2
1.F 560.020.360 O-RING 6
AIR DISTRIBUTION VALVE SERVICING
STEP #1: Remove Air Valve
The main air valve sleeve and spool set is located in the valve body mounted on the pump with four
hex head cap-screws. The valve body assembly is removed from the pump by removing these four hex
head cap-screws.
STEP #2: Disassembly of the Air Valve
With the valve body assembly off the pump, access to the sleeve and spool set is made by removing four
hex head cap-screws (each end) on the end caps of the valve body assembly.
With the end caps removed, slide the spool back and forth in the sleeve. The spool is closely sized
to the sleeve and must move freely to allow for proper pump operation. An accumulation of oil, dirt or other
contaminants from the pump’s air supply, or from a failed diaphragm, may prevent the spool from moving
freely. This can cause the spool to stick in a position that prevents the pump from operating. If this is the
case, the sleeve and spool set should be removed from the valve body for cleaning and further inspection.
Remove the spool from the sleeve.
Using an arbor press or bench vise (with an improvised mandrel), press the sleeve from the valve
body. Take care not to damage the sleeve.
At this point, inspect the o-rings on the sleeve for nicks, tears or abrasions. Damage of this sort could
happen during assembly or servicing. A sheared or cut o-ring can allow the pump’s compressed air supply
to leak or bypass within the air valve assembly, causing the pump to leak compressed air from the pump
air exhaust or not cycle properly. This is most noticeable at pump dead head or high discharge pressure
conditions.
Replace any of these o-rings as required or set up a routine, preventive maintenance schedule to
do so on a regular basis. This practice should include cleaning the spool and sleeve components with a
safety solvent or equivalent, inspecting for signs of wear or damage, and replacing worn components.
Reassembly of the Air Valve
To re-install the sleeve and spool set, lightly lubricate the o-rings on the sleeve with an o-ring
assembly lubricant or lightweight oil (such as 10 wt. air line lubricant).
Re-install one end cap, gasket and bumper on the valve body.
Using the arbor press or bench vise that was used in disassembly, carefully press the sleeve back
into the valve body, without shearing the o-rings. You may have to clean the surfaces of the valve body
where the end caps mount. Material may remain from the old gasket. Old material not cleaned from this
area may cause air leakage after reassembly.
Take care that the bumper stays in place allowing the sleeve to press in all the way.
Reinstall the spool, opposite end cap, gasket and bumper on the valve body.
After inspecting and cleaning the gasket surfaces on the valve body and intermediate, reinstall the
valve body on the pump using new gaskets.
Tighten the four hex head cap-screws evenly and in an alternating cross pattern.