Suction Sideplate
Replace if sideplate shows excessive metal loss due to corrosion, erosion or wear.
Shaft
Check for runout to see that the shaft is not bent. Bearing seats and labyrinth seal areas must be in per-
fect condition and free of scratches and grooves. O.D. and finish in these areas must be within bearing
manufacturer’s specifications. Check that the keyway is free of corrosion. Replace shaft if necessary.
Shaft Sleeve
The shaft sleeve is a push fit and is bored 0.001" to 0.003" larger than the shaft and should tap easily on
the shaft. If the sleeve does not tap on easily, the bore and shaft should be inspected to see that they are
free from foreign matter or burrs. The fit of the key in the keyway should also be checked to see that it is
not causing binding. The key should have a sliding fit on the sides and should have clearance at the top.
Sleeve surface in stuffing box must be smooth and free of grooves. If grooved, replace. O-ring groove
must be in good condition. The original diametrical clearance between shaft sleeve and stuffing box bore
is 0.025" to 0.032". If this clearance has increased to more than 0.050", the shaft sleeve, and at times the
stuffing box, should be replaced.
Mechanical Seal
Lapped seal faces, gaskets, and shaft sealing members must be in perfect condition or excessive leak-
age may result.
Replace worn or damaged parts.
Ball Bearings
Replace if worn, loose, rough or noisy when rotated. Replacement bearings must be of the proper size
and type as specified in the construction details (Table 6).
Labyrinth Oil Seals
Inspect and replace if O-rings are torn or otherwise damaged.
General
All parts should be clean before assembly. This is especially important at O-ring grooves, threads, lock
fits, gasket surfaces and bearing areas. Any burrs should be removed with crocus cloth. Replace all gas-
kets and o-rings when maintenance is performed.
6.5 Reassembly of pump
CAUTION:
Wear insulated gloves when using a bearing heater. Bearings will get hot and can cause physi-
cal injury.
This procedure covers reassembly of the pump after complete disassembly. Be sure all directions in the
Inspection and Overhaul section have been followed.
NOTICE:
There are several methods used to install bearings. The recommended method is to use an
induction heater that heats as well as demagnetizes the bearings.
6.5 Reassembly of pump
42
3500XD Installation, Operation and Maintenance Instructions
