801-B00 Page 19/24
MAINTENANCE
11.
LOCKNUT ADJUSTMENT
It is important that the bearing locknuts (24A) and
lockwashers (24B) be installed and adjusted properly.
Overtightened locknuts can cause bearing failure or a
broken lockwasher tang. Loose locknuts will allow the
rotor to shift against the heads (20), causing wear.
a. On both ends of the pump shaft, Install a lockwasher
(24B) with the tangs facing outward, followed by a
locknut (24A) with the tapered end inward. Ensure the
inner tang "A" of the lockwasher is located in the slot
in the shaft threads, bending it slightly, if necessary.
b.
Tighten both locknuts (24A) to ensure that the
bearings (24) are bottomed in the head recess. DO
NOT overtighten and bend or shear the lockwasher
inner tang.
c. Loosen both locknuts one complete turn.
d. Tighten one locknut until a slight rotor drag is felt
when turning the shaft by hand.
e. Back off the nut the width of one lockwasher tang "B".
Secure the nut by bending the closest aligned
lockwasher tang into the slot in the locknut. The pump
should turn freely when rotated by hand.
f. Tighten the opposite locknut (24A) by hand until it is
snug against the bearing (24). Then, using a spanner
wrench, tighten the nut the width of one lockwasher
tang. Tighten just past the desired tang, then back off
the nut to align the tang with the locknut slot. Secure
the nut by bending the aligned lockwasher tang into
the slot in the locknut. The pump should continue to
turn freely when rotated by hand.
g. To check adjustment, grasp the nut and washer with
fingers and rotate back and forth. If this cannot be
done, one or both locknuts are too tight and should
be alternately loosened one stop at a time (.001" – 25
microns). Begin by loosening the locknut adjusted
last.
14. Inspect the grease seal (104) for wear or damage and
replace as required. Grease the outside diameter of the
grease seal and push it into the inboard bearing cover
(27) with the lip of the seal inward.
15. Attach a new bearing cover gasket (26) and the bearing
cover (27) to the seal cartridge (153). Make sure the
grease fittings (76) are accessible. Install and torque the
bearing cover capscrews (28) to 30 lbs ft (40.7 Nm).
16. Install the grease seal (104) and bearing cover (27) on
the opposite side of the pump per steps 15-16.
17. 2-inch pumps: Slide the dirt shield (123A) over the shaft
and push it firmly against the inboard bearing cover.
18. Attach the shaft protector (186) to the non-driven shaft
end of double ended pumps.
Operation without guards in place can
cause serious personal injury, major
property damage, or death.
Do not operate
without guard
in place
19.
RELIEF VALVE ASSEMBLY
a. Insert the valve (9) into the relief valve bore of the
casing with the fluted end (2 and 3-inch pumps) or
stepped bore end (4” pumps) inward.
b. Install the relief valve spring (8) and spring guide (7)
against the valve.
c. Attach a new relief valve O-ring (10) and the valve
cover (4) on the casing (21).
d. Screw the relief valve adjusting screw (2) with locknut
(3) into the valve cover (4) until it makes contact with
the spring guide (7).
e. After the relief valve has been adjusted, tighten the
locknut (3) and install the relief valve cap (1) and O-ring
(88)
NOTICE:
The relief valve setting MUST be tested and
adjusted more precisely before putting the pump
into service. Refer to "Relief Valve Setting and
Adjustment"
20. See "Pre-Start Up Check List" and "Start Up
Procedures" sections of this manual prior to restarting
pump operation
