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6.
Install the woodruff keys in the shaft keyslots and press the
timing gears onto the shafts.
7.
Carefully align the timing marks on the gears as shown in Figure
Eight.
8.
Install the timing gear retaining rings (Part No. 98).
9.
On Model PR300, PRE300 and PRED300 pumps, assemble
lockwasher (Part No. 69) and locknut (Part No. 22) on the shafts.
10. Tighten locknut firmly and lock in place by bending a tab into a
slot on the locknut.
11. Insert seal in gear cover, carefully fit the cover gasket to the
cover and secure the gear cover to the pump frame with the cap
screws.
12. Install the drain plug, fill the oil reservoir to the proper oil level
and install the vent plug and the oil level plug.
13. Assemble the cleanout cover to the pump frame.
14. Install the alignment locating rings. Be sure to align the slots in these rings with the grease
fittings.
15. Install the shaft o-rings and the wear rings.
16. Slide the seal rings onto the shafts and carefully align the tangs of the seal rings with the slots
in the casing.
17. Assemble the casing o-rings and casing and slide into place.
Note:
The seal rings and pump casing can become permanently damaged if tangs are not
properly aligned. Do not lubricate seal faces. Carbon will be damaged if lubricated.
18. Install the rotors and place casing cover o-ring in casing cover groove. Secure the cover to
the casing with the casing nuts.
19. Assemble relief cover in the reverse order of disassembly.
20. Rotate the drive shaft. If the pump rotates smoothly and is not leaking oil, mount it on the
base, and connect the flexible coupling to the pump shaft.
21. Align the coupling according to instructions given under the
Installation section of this manual.
IMPORTANT:
Be sure the bearings have been lubricated and gear oil added before placing
the pump back in service.
22. Connect the suction and discharge piping, and the water line to the seal flush assembly.
23. Reset pressure relief valve as described in relief cover adjustment.
MAINTENANCE
Figure Eight
Timing Gears and Marks
Timing
Marks
