Impeller Lockscrew Installation; Lubrication; Impeller Lockscrew Removal; Frame Disassembly And Assembly - Generac Power Systems MAGNUM Owner's Manual

For seals, bring the gland and gasket against the
7.
face at the seal chamber and tighten the bolts
evenly.

Impeller Lockscrew Installation

Impeller lockscrews are always right hand socket head
.38- 6UNC
.50-13UNC
.62-UNC
.75-10UNC
1.00-8UNC
1.12-7UNC
1.25-7UNC
1.50-7UNC

Lubrication

Do not lubricate the impeller lockscrew or tapped hole,
between the lockscrew and impeller washer, or between
the impeller washer and impeller. Verify parts are clean
and dry; however, it is not necessary to remove the
protective coating from the screw. Lubricated bolts can be
overstressed with the torques indicated.
NOTE: Do not use the lockscrew to install the impeller.
NOTE: Lockscrew failure can damage the impeller and
volute. The impeller screw must be of the best material,
properly forged and machined to rigid specifications not
available from local suppliers. Purchase only lockscrews
available from Generac Power Products for assurance of
quality.

Impeller Lockscrew Removal

Break the impeller lockscrew loose with a breaker
1.
bar.
NOTE: Care should be taken when removing lockscrew
to prevent damaging the screw head.
If the breaker bar will not loosen the impeller
2.
lockscrew, apply heat to the lockscrew for 2-4
minutes. Do not exceed 400°F (204°C).
WARNING
Risk of Burns. Take care when applying heat
to the lockscrew. Failure to do so could result
in serious injury.
Owner's Manual for Dry-Prime Diesel Trash Pumps
Table 5 - Lockscrew Torque Values
Torque for Stainless Steel Lockscrew (nonmagnetic)
Size
20 ft-lbs (27 Nm)
40 ft-lbs (54 Nm)
90 ft-lbs (122 Nm)
135 ft-lbs (183 Nm)
265 ft-lbs (359 Nm)
360 ft-lbs (488 Nm)
510 ft-lbs (691 Nm)
875 ft-lbs (1186 Nm)
(000276)
capscrews. Stainless steel lockscrews are supplied with
Loctite 262, which should be applied to lockscrew threads
and shaft prior to installation.
First determine the size and material of the lock, then
torque to the appropriate value listed in the table below.
302, 303, 304, 316 Series
Allow lockscrew to cool and remove with a breaker
3.
bar.

Frame Disassembly and Assembly

Disassembly

Remove the deflectors from the shaft.
1.
Remove the drive end shaft key.
2.
Remove the capscrews from the bearing cover or
3.
drive end bracket.
NOTE: Grease lubricated frames have a single lip seal
at the drive end pump ends. If the lip seals are to be
saved, the shaft should be cleared of burrs or sharp pro-
trusions which would cut the seal. If the seals are
removed or replaced, refer to
for orientation of the lips. Paired seals have a grease
passageway between them and are arranged so that the
grease will move through the inner and outer seal.
Slide the bearing cover or drive end bracket off the
4.
shaft. Remove the capscrews from the pump
bracket. Slide the pump bracket off the shaft.
The shaft and bearings can now be removed by
5.
pressing on the drive end of the shaft.
Remove the bearings from the shaft with a bearing
6.
puller. If the bearings are to be saved, keep them
absolutely clean. If contaminated, wash only in
clean fluid.
NOTE: Never hammer the shaft or parts attached to the
shaft or you will damage both the shaft and the bearings.
Maintenance
Figure 4-2 or Figure 4-6
49