BLACKMER LDF1A, Installation, Operation And Maintenance Instructions

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501- F 00 Page 9/12
MAINTENANCE
33. Using a keyed coupling half, hold the shaft end and
tighten the locknut with a spanner wrench to pull the
head against the cylinder. DO NOT overtighten and
shear the inner tang of the lockwasher.
34. Uniformly tighten the head capscrews, torquing to 25 lbs
ft (34 Nm).
35. Loosen both bearing locknuts (24A).
36. Rotate the shaft to test for binding or tight spots. If the
rotor does not turn freely, tap the rim of the head with a
soft faced mallet until the correct position is found.
Figure 8– Locknut Assembly
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 8.
37. 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.
38. 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.
39. Loosen both locknuts (24A) one complete turn.
40. Tighten one locknut (24A) until a slight rotor drag is felt
when turning the shaft by hand.
41. 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.
42. 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.
43. 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.
44. Attach the new bearing cover gasket (26) and the bearing
cover (27) to the non-driven side of pump with the grease
fitting (76) upward. Install and tighten the bearing cover
capscrews (28), torquing to 15 lbs ft (20 Nm).
45. Inspect the grease seal (104) in the foot bracket for wear
or damage and replace as required. Grease the outside
diameter of the grease seal (104) and push it into the
bracket (108 or 108B) with the lip inward.
46. Mount the assembled pump on the foot bracket (108 or
108B) with the four mounting screws (28A).
47. Reinstall coupling, shaft key, and coupling guards.
48. Refer to “Pre-Start Up Check List” and “Start Up
Procedures” sections of this manual prior to restarting
pump operation.
RELIEF VALVE ASSEMBLY
1. Insert the valve (9) into the relief valve bore of the casing
with the small end inward.
2. Install relief valve disc (9A) into relief valve.
3. Install the relief valve spring (8) in the valve bore.
4. Install new O-ring (4A) on spring guide (7).
5. Install spring guide (7) in valve bore of cylinder, aligning
spring (8) on spring guide during assembly.
6. Install new O-ring (10) in O-ring groove in relief valve cap
(4).
7. Apply a thin coat of grease on threads of relief valve cap
(4) and install in cylinder (12).
8. Screw the relief valve adjusting screw (2) with locknut (3)
into the valve cover (4) until it makes contact with the
spring guide (7).
9. After the relief valve has been adjusted, tighten the
Locknut (3)
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"
10. Refer to “Pre-Start Up Check List” and “Start Up
Procedures” sections of this manual prior to restarting
pump operation.
Do not operate
without guard
in place
OPERATION WITHOUT GUARDS IN
PLACE CAN CAUSE SERIOUS
PERSONAL INJURY, MAJOR
PROPERTY DAMAGE, OR DEATH.
Do not operate
without guard
in place
FAILURE TO ADJUST GUARDS
COVERING ALL ROTATING PART,
ALLOWING ONLY A SAFE GAP, CAN
CAUSE PERSONAL INJURY OR DEATH