105-A00 Page 9/12
MAINTENANCE
Figure 7 – Locknut Assembly
15. LOCKNUT ADJUSTMENT
It is important that the bearing locknuts (24A) and
lockwashers (24B) be installed and adjusted properly.
Overtightening locknuts can cause bearing failure or a
broken lockwasher tang. Loose locknuts will allow the
rotor to shift against the discs (71), causing wear. See
Figure 7.
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 (24B) 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 (24A) one complete turn.
d. Tighten one locknut (24A) 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 “B”. 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 (24A)
adjusted last.
16. 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) or bracket mount (108) with the lip of the seal
inward (towards the pump).
17. Attach a new bearing cover gasket (26) and the inboard
bearing cover (27) to the inboard head (20). Install the
outboard bearing cover (27A) and a new gasket to the
outboard head. Make sure the grease fittings (76) on the
bearing covers are accessible. Install and torque the
bearing cover capscrews (28) to 8 lbs ft (10.8 Nm).
18. On flange mounted pumps, the bracket mount takes the
place of the inboard bearing cover (27). To attach the
bracket mount to the head, install a new bearing cover
gasket (26) and the four mounting screws (28A).
19. RELIEF VALVE ASSEMBLY
a. Insert the valve (9) into the relief valve bore of the
casing with the fluted end 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 cylinder.
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. Reinstall coupling, shaft key, and coupling guards.
Do not operate
without guard in
place.
OPERATION WITHOUT GUARDS IN
PLACE CAN CAUSE SERIOUS
PERSONAL INJURY, MAJOR
PROPERTY DAMAGE, OR DEATH.
21. Refer to “Pre-Start Up Check List” and “Start Up
Procedures” sections of this manual prior to restarting
pump operation.
Содержание XLW1 1/2
Страница 11: ...105 A00 Page 11 12 NOTES...
