REBUILD:
Use the exploded parts view with these instructions
and note recommended replacement parts for the
rebuild process.
1. Disconnect and removed the pump end from the
driver.
2. Relieve the double seal cavity pressure by
pulling the pin on the relief valve.
3. Remove and replace the flapper assembly and
discharge gasket. Tighten the inlet and discharge
flange fasteners to 24 ft-lbs.
4. Remove 6 nuts from the adaptor and disassemble
the rotating assembly form the housing.
5. Inspect the wearplate for abrasive wear and
replace if necessary using new screws, gaskets
and acorn nuts.
6. Clean and remove all grease from the adaptors
and impeller sleeve. Discard the seal rotating
parts.
7. Remove the seal seats from the adaptors and
discard.
8. FM5&8 impellers are threaded onto a drive
sleeve and fastened with a jam nut. The sleeve
of a FM10&15 is an integral part of the impeller.
9. Inspect the impeller for abrasive wear at the
edges of the machined surfaces. If they are not
well defined the impeller should be replaced.
10. Remove the grease reservoir from the adaptor.
REASSEMBLE:
1. Using a water-soluble lubricant, lubricate the
seal seat o-rings and seal housing bores. Install
new seal seats into the adaptors with the polished
sides of the seat up. Install by hand using your
thumbs to squarely locate the seats against the
shoulder of the adaptors. Wipe the seal faces dry
with a rag.
2. Place the impeller inside the pump housing.
3. Install the housing gasket over the housing studs
and position it on the housing gasket face.
4. Slide the double seal adaptor over the impeller
and studs with the relief valve properly aligned
and the seal seat facing up. The adaptor should
rest on the pump housing gasket squarely.
5. Using a water-soluble lubricant, lubricate the
impeller sleeve and the seal rotary bellows inner
diameters.
6. Install the seal rotary with the hard silicon
carbide face so that the face is against the seal
seat. Use care to push on the tail of the bellows
and not on the seal head outer diameter.
7. Position the spring over the sleeve onto the seal
head.
8. Install the remaining seal rotary (carbon face) tail
first over the sleeve to make contact with the
spring.
9. Place another housing gasket over the studs and
install the driver adaptor onto the pump
assembly to compress the seal spring. Tighten 6
nuts with lockwashers to 28 ft-lbs. with a
crosswise pattern.
10. Slide the drive sleeve clamp assembly on the
sleeve.
11. Pull the clamp assembly and sleeve back out of
the pump and slide a shim inside the pump
discharge between the wearplate and impeller
vanes. Shim material thickness should be .02-
.03 inches.
12. Fill the seal cavity with grease using a suitable
grease gun until grease comes out of the pipe tee
(approx. 9 ounces).
13. Install and tighten the reservoir
14. Add more grease to fill the reservoir until the
relief valve opens.
The pump can now be installed to the driver as a
pumpak.
WWW. MPPUMPS. COM
Form 3064-A
9/03
(2 pages)
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