Schreiber Chillers MC75WC - Manual (Page 8)

MC75 - WC
6.1.1. Single-phase motor: Non-reversible.
6.1.2. Three-phase motor: Interchange any two
power supply leads.
7.1. Before starting, pump must be primed (free of air and
suction pipe full of liquid) and discharge valve partially
open.
CAUTION
Pumped liquid provides lubrication. If pump is run dry,
rotating parts will seize and mechanical seal will be
damaged. Do not operate at or near zero flow. Energy
imparted to the liquid is converted into heat. Liquid may
flash to vapor. Rotating parts require liquid to prevent
scoring or seizing.
7.2. Make complete check after unit is run under operating
conditions and temperature has stabilized. Check fro
expansion of piping. On frame-mounted units coupling
alignment may have changed due to the temperature
differential between pump and motor. Recheck
alignment.
8.1. Close-coupled Unit. Ball bearings are located in and
are part of the motor. They are permanently lubricated. No
greasing required.
8.2. Frame-Mounted Units:
8.2.1. Bearing frame should be re-greased every
2,000 hours or three month interval, whichever
occurs first. Use a #2 sodium or lithium based
grease. Fill until grease comes out of relief
fittings, or lip seals, then wipe off excess.
8.2.2. Follow motor and coupling manufacturers’
lubrication instructions.
8.2.3. Alignment must be rechecked after any
maintenance work involving and disturbance of
the unit.
Complete disassembly of the product will be described.
Proceed only as far as required to perform the
maintenance work needed.
9.1. Turn off Power.
9.2. Drain system. Flush if necessary.
9.3. Close-Coupled Units: Remove motor hold-down
bolts. Frame-Mounted Units: Remove coupling, spacer,
coupling, spacer, coupling guard and frame hold-down
bolts.
9.4. Disassembly of Liquid End:
9.4.1. Remove casing bolts (370).
9.4.2. Remove back pull-out assembly from
casing (100).
9.4.3. Remove impeller locknut (304).
CAUTION
Do not insert screwdriver between impeller vanes to
prevent rotation of close-coupled units. Remove cap at
9.4.4. Remove impeller (101) by turning counter-
clockwise when looking at the front of the pump.
Protect hand with rag or glove.
CAUTION
Failure to remove impeller in a counter-clockwise
direction may damage threading on the impeller, shaft or
both.
9.4.5. With two pry bars 180° apart and inserted
between the seal housing (184) and the motor
adapter (108), carefully separated the two parts.
The mechanical seal rotary unit (383) should come
off the shaft with the seal housing.
9.4.6. Push out the mechanical seal stationary seat
from the motor side of the seal housing.
9.5. Disassembly of Bearing Frame:
9.5.1. Remove bearing cover (109).
9.5.2. Remove shaft assembly from frame (228).
9.5.3. Remove lip seals (138 & 139) from bearing
frame and bearing cover if worn and are being
replaced.
9.5.4. Use bearing puller or arbor press to remove
all ball bearing. (112 & 168).
10.1. All parts should be cleaned before assembly.
10.2. Refer to parts list to identify required replacement
items. Specify pump index or catalog number when ordering
parts.
10.3. Reassembly is the reverse of disassembly.
10.4. Observe the following when reassembling the bearing
frame:
10.4.1. Replace lip seals if worn or damaged.
10.4.2. Replace ball bearings if loose, rough or
noisy when rotated.
10.4.3. Check shaft for runout. Maximum
permissible is .002” T.I.P.
10.5. Observe the following when reassembling the liquid-
end:
10.5.1. All mechanical seal components must be
in good condition or leakage may result.
Replacement of complete seal assembly,
whenever seal has been removed, is a good
standard practice.
10.5.2. Inspect casing O-ring (513) and replace if
damaged. This o-ring may be lubricated with
petroleum jelly to ease assembly.
10.5.3. Inspect guidevane O-ring (349) and replace
if worn.
CAUTION
Do not lubricate guidevane O-ring (349). Insure it is not
pinched by the impeller on reassembly.
10.6. Check reassembled unit for binding. Correct as
required.
10.7. Tighten casing bolts in a star pattern to prevent O-ring
binding.
10. Reassembly:
8. Maintenance:
7. Operation:
9. Disassembly:
9