Assembly; Lubrication Instructions; Mechanical Seal Maintenance; Mechanical Seal Oil - Generac Power Systems MAGNUM Owner's Manual

Maintenance

Assembly

Press the drive end and pump end bearings onto
1.
the shaft. Pressure should be applied to the inner
race.
Press the shaft into the frame through the drive
2.
end until the pump end bearing is approximately
flush with the pump end of the frame.
Install the pump end lip seal(s) into the bracket.
3.
Slide the pump bracket over the shaft, taking care
not to damage or fold the lip seal(s). Install and
tighten the capscrews.
Install the lip seal(s) in the bearing cover or drive
4.
end bracket. Install the shims in the drive end of
the frame (if present when disassembled). If new
shaft, bearings, frame, bearing cover or drive end
bracket are being installed, insert shims to maintain
0.007-0.012 in. (0.177-0.304 mm) shaft end play.
Slide the bearing cover or drive end bracket over
the shaft. Install and tighten the capscrews.
Install the deflector and lubricate. Refer to
5.
Lubrication Instructions.

Lubrication Instructions

Bearings in all frames are greased at the factory before
shipment.
Lubrication requirement vary with speed, power, load,
Table 6 - Recommended Re-Greasing Periods for Frames
Total Running Time
8 Hour Day Service
24 Hour Day Service
Approximate Amount of Grease per
Line Fitting
Approximate No. of Pumps with
Grease Gun (hand operated)

Mechanical Seal Maintenance

The location of the mechanical seal in your pump is shown
in Figure 4-3. The stationary seat is held in the backplate.
All other parts of the seal rotate with the shaft and impeller.
The seal chamber must be full of liquid before operating
the pump.
No maintenance is required for the mechanical seal.
However, the pump should be examined at regular
intervals for leakage resulting from wear of the sealing
faces. Occasionally, new installations will leak for a short
time. These must be inspected daily. If the leakage does
not reduce to almost zero, the assembly should be
examined for proper seal installation. Replace damaged
50
Frame Size
2-5-11 and EM309 6-7-8-16 60B4
through 68B4
2,000 hours 1,500 hours
36 weeks 27 weeks
12 weeks 9 weeks
.5 cubic inch 1.25 cubic inch
3 pumps 6 pumps
ambient temperatures, exposure to contamination and
moisture, seasonal or continuous operation and other
factors. The brief recommendations which follow are
general in nature and must be coupled with good judgment
and consideration of the application conditions. For re-
greasing periods, refer to the table below. When adding
grease, verify the grease and fittings are absolutely clean.
Grease used for these bearings should be equivalent to
one of the following manufacturer's products:
• G.E. Long Life Grease No. D682C5
• Mobil Mobilux No. EP2
• Shell Alvania EP2
• Texaco Multifak AFB 2
To lubricate frame bearings, remove the plastic cover and
grease fittings. Verify the fitting and end of the grease gun
are clean. Use a hand-operated grease gun and pump a
small amount into each bearing cavity. The surplus grease
will go through the bearing and into the center part of the
frame.
For re-greasing periods and approximate quantity, refer to
the table below.
First determine frame size (located on serial number plate).
Example: 5HH-65B4, 4NNT-VF16, 10YB-F18DB, 6NHTA-
VC18, 4RB-EM16
10-12-13-13D
18-18D
1,000 hours
18 weeks
6 weeks
2 cubic inch
12 pumps
seals or mechanical seal oil as necessary.

Mechanical Seal Oil

The mechanical seal oil level should be maintained to the
top line of the reservoir; however, oil will circulate as long
as the oil level is above line of the reservoir. Refer to the
Table 4 for recommended mechanical seal oil change
interval.
Mechanical seal oil can be added either during pump
operation or while shut down. If water begins to accumulate
in the reservoir, or the oil level depletes rapidly, this may
indicate mechanical seal failure. Leakage of oil from the
Owner's Manual for Dry-Prime Diesel Trash Pumps
20-24 30
1,350 hours 2,000 hours
24 weeks 36 weeks
8 weeks 12 weeks
3 cubic inch 4 cubic inch
18 pumps 23 pumps