Page 30 of 38
3.
Press new bushings in impeller housing.
4.
Press bronze bushings in gear case.
5.
Remove expansion plug in gear case cover.
6.
Press out worn bushings and press new bushings in gear case cover.
CAUTION
If impeller housing bushing is steel backed PTFE, do not ream.
7.
Check gear case lip seals and bearings for damage. Replace parts as necessary.
Reassemble In Accordance With Minor Reassembly
1.
Apply grease to gasket seal surface on impeller housing. Then press impeller-housing gasket in place. Grease is used to hold gasket
in position.
2.
If Packing is used (reference assembly on page 26). Place packing glands (42) in seal chambers of housing (40). Also, reference Page
39 for additional packing information. If Tuffseals are used (reference assembly on page 28). Make sure the Tuffseal on the impeller
housing side is ready to accept the shafts and that the collar set screws are unscrewed enough so that the shafts can slide through
the collars easily. Also, reference Page 40 for additional Tuffseal information. If mechanical seals are used (reference assembly on
page 30). Make sure the mechanical seal bodies in the impeller housing stuffing boxes are ready to accept the shafts and that the
seal set screws are unscrewed enough so that the shafts can slide through the seals easily. Also, reference Page 41 for additional
mechanical seal information.
3.
After checking for burrs, insert shafts, through housing bushing, packing glands/mechanical seals/Tuffseals and gear case bushings.
V-rings (43) should also be installed while inserting the shafts. Be aware that the V-rings need to be slid onto the shafts because of
their snug fit. Note: Insert drive shaft on same side as when disassembled.
4.
Tighten cap screws, which hold faceplate in place.
5.
Slip fit timing gears. Install carbon steel gear keys in shaft keyways. Slip proper timing gear on driven shaft. Then slip timing gear on
drive shaft, revolving shaft to align woodruff key with gear keyway, taking precautions that the timing marks are face out and aligned.
These marks are two center punch marks on the gear on the drive shaft and one center punch mark on the mating tooth cavity. Then
turn pump drive shaft over several times to be certain that there is no interference from being out of time. Tighten setscrews on
shaft. Then install locking setscrew.
6.
Interference fitted timing gears. Make sure that gears are properly marked with the timing marks and that the bores and keyways are
free of burrs. Repair as necessary. Heat the gears to 500°F-550°F in an oven for 40 minutes. Add keys to the drive and driven shafts.
WARNING
Wear heat-resistant gloves when handling hot components.
7.
Install the timing gear on the driven shaft first, making sure that the timing marks are facing outward. Assure that the driven gear
has cooled before installing the drive gear. Match the timing gears and install the drive gear. Rotate the shafts after the gear cools
to assure the correct timing of the impellers.
8.
If timing is correct, apply grease to gasket seal surface on gear case. Press gear case gasket in place.
9.
Slide gear case cover over shafts, being certain that drive shaft bore in cover is properly positioned in relation to drive shaft. Then
tighten cap screws holding gear case cover in place. CAUTION: Take care in slipping lip of oil seal over drive shaft. If proper care is
not taken, the lip will be damaged and oil leakage will result.
10.
If Packing is used (reference assembly on page 26). Install new packing in seal chambers and tighten packing gland nuts to finger
tightness. If pump is equipped with mechanical seals, install them according to the seal instructions and reference 12c for general
instructions. Also, reference Page 39 for additional packing information. If Tuffseals are used (reference assembly on page 28). Use
the seal spacers to set the right collar location. After setting the end clearances, tighten the gland nuts and then collar set screws to
lock the seal collar onto the shaft. Finally, turn the spacers away from the collar so they will not interfere with it during operation.
Also, reference Page 40 for additional Tuffseal information. If mechanical seals are used (reference assembly on page 30). Position
