17
MAINTENANCE
Flowmeter
(4 GPM – Model Code ¼)
Inspect or Replace Bluff Assembly
Tools required: #4 Allen wrench; clean paper towels within easy reach.
Spare parts: Bluff body PN# 7482-2, O-Ring PN#345 (2-010), Reference 4-40 x ¼ lg stainless socket
head screw PN# 109, approved O-Ring lube.
1. Procedure to remove bluff:
1.1. Place unit on clean surface upside down.
1.2. Remove both #4-40 SSHS with the #4 Allen wrench.
1.3. Pull the bluff from the body. Note the flat side of the bluff flange head. The orientation of the
flat side is critical when reassembling the unit.
1.4. Remove the O-ring.
1.5. Inspect bluff for wear or foreign material wrapped around it.
1.6. Inspect the O-Ring to see if it needs to be replaced.
1.7. Clean bluff with soap and water or simply replace it with a new one.
2. Procedure to reinstall bluff:
2.1. Install O-ring (P/N 345 (2-010)) with light coating of approved O-ring lube oil into counter
bore in body. Make sure that the O-ring is not twisted.
2.2. Insert the bluff into the body. Note that the flat on the bluff flange head will only allow the
bluff to be installed in one position. Secure the bluff to the body using (2) #4-40 x ¼ lg.
stainless socket head screws P/N 109. Do not over-tighten.
Shut-Off Valve
Replace Coil
Tool Required: No Tools Required
Spare Parts: #2705-24V-COIL
Remove the DIN connector with the Phillips screwdriver and pull from coil.
1. Pull spring clip from side of coil until you can remove coil off Guide.
2. DC Coil part number #.
3. Install new coil, push spring clip inward over coil and plug in DIN connector to coil.
4. Test to determine if coil is operational.
5. If there are problems, contact Service Department at Rocon LLC - 248-542-9635.
Clean Diaphragm Orifice / Plunger Pilot Hole
Tools required: #4 Allen wrench, 22 mm Open End Wrench
1. Remove the DIN connector with the Phillips screwdriver.
2. Remove coil by pulling spring clip outward until coil can be removed.
3. Remove the 4 socket head screws with the #4 Allen wrench.
4. Gently pull the valve cover upward. Caution: Pressure spring is located in valve cover.
5. With valve cover and pressure spring removed, the diaphragm is sitting on the valve body.
6. Lift diaphragm off its seat and examine. Remove any foreign material on the diaphragm with soap
and water.
7. Hold the diaphragm up to light source. Observe small orifice below the pilot hole in diaphragm. If
it is plugged, remove dirt with soap and water. Replace diaphragm in valve body with 4 guide legs
going in first and the outer pilot hole fitting into the valve body molded surface.
8. With the valve cover upside down, direct flashlight into the pilot hole. If you suspect hole is
plugged, you will have to remove the screw piece and the guide with the inch box wrench.
9. The guide encloses the pressure spring and plunger. Spring fits inside the plunger.
10. With the guide and screw piece removed, check the orifice for any foreign matter. If present,
remove with soap and water.
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