P. 5
The balance of the manual describes the maintenance procedures for the specific
type of seal involved.
Maintenance for a sealed gear pump is minimal. Periodic lubrication of the packing
and tightening of the gland screws and fluid in the double seal loop are the major
maintenance items. When the gland screws cannot stop the packing from leaking
excessively, or the mechanical seal starts to leak, or a decrease in head is observed, repair is
necessary.
PUMP DISASSEMBLY
1)
Remove the coupling guard and disconnect the flexible coupling.
2)
Disconnect the pump's center housing (21) from the piping and remove the pump.
3)
Remove the gland screws (16), lock washers (19) and the gland (17).
Note: For the 312, H12 and 314 go to step 12.
4)
(A)
Refer to section (A) for removal of the packing.
(B)
Refer to section (B) for removal of the lip seal.
(C)
Refer to section (C) for removal of a single seal.
(D)
Refer to section (D) for removal of an external seal.
(E)
Refer to section (E) for removal of a double seal.
5)
Remove the four housing bolts (4), housing nuts (10) and lock washers (15) which
secure the front housing (8) and rear housing (2) to the center housing (21).
6)
Remove the wear plates (7) and housing o-ring (5).
7)
Remove the drive and idler shaft assemblies.
8)
Remove the gears (22) and (6) from the shaft by removing the retaining rings (14).
Remove retaining rings by inserting a pointed tool in the split and prying off.
NOTE:
Exercise care during removal as not to damage the grooves.
Front Housing
Gear
