9
F-2) Impeller and Volute Service:
F-2.1) Disassembly and Inspection:
To clean out volute (26) or replace impeller (28) and impeller
ring (48), or replace wear ring (31), disconnect power,
remove hex nuts (20) and vertically lift motor and seal
assembly from body (26). Remove socket head screws (51)
and suction cover (50) from volute (26). Clean out body if
necessary. Clean and examine impeller (28) for pitting or
wear, also check impeller ring (48) for scaring or excessive
wear, replace if required.
NOTE:
If impeller (28) is replaced,
also replace impeller ring (48). If only the impeller ring (48)
requires replacing, split the ring and remove, be careful not
to damage impeller. Inspect gasket (41) and replace if cut or
damaged.
If the impeller (28) requires replacing, remove cap screw (8)
and spacer (35). The impeller is keyed onto the shaft with a
square key (33) and to remove, pull impeller straight off the
shaft using a wheel puller, if required. If the wear ring (31)
requires replacing, split the wear ring (31) and remove,be
careful not to damage the suction cover. Before reinstalling,
check the motor shaft and impeller bore for damage.
F-2.2) Reassembly:
To install wear ring (31) fi rst apply retaining compound to
the bore of suction cover (50) and then press wear ring (31)
into bore of suction cover (50) until seated. Locate suction
cover (50) on volute (26), apply thread locking compound
to socket head screws (51) and tighten into volute (26).
To install impeller (28), fi rst apply retaining compound to
groove at bottom of impeller and press impeller ring (48) on
impeller (28), then apply a thin fi lm of oil to motor shaft and
slide impeller straight onto shaft, keeping keyways lined
up. Drive key (33) into keyway. Locate spacer (35), apply
thread lock primer (such as LOCTITE® Primer T), let set per
manufacture’s directions, to cap screw (8) threads, thread
cap screw (8) into shaft and torque to 35 ft. lbs. Rotate
impeller to check for binding.
Position gasket (41) on volute fl ange and install impeller and
motor housing over studs and onto volute (26). Apply thread
locking compound to threads of each stud (24). Thread nut
(20) onto stud (24) and torque to 24 ft. lbs. Check for free
rotation of motor and impeller.
F-3) Motor and Bearing Service
F-3.1) Disassembly and Inspection:
To examine or replace the motor (1) and bearings (3) and
(47), disassemble pump, volute and impeller (as outlined in
paragraph F-2.1) and disassemble seal plate and shaft seal
(as outlined in paragraph F-4.1). Drain oil from motor as
outlined in paragraph F-1.3.
Position unit upright, using blocks to avoid resting unit on
shaft. After removal of cable and box assembly (10) from
motor housing (2), remove cable lead wires from motor lead
wires and moisture and temperature sensors wires from
control cable by unscrewing connectors (12) and (17).
The wiring connections should be noted to insure correct
connections when reassembling. Remove cap screws (19)
and hex nuts (20). Vertically lift the outside motor housing (2)
from bearing bracket (21) with lifting strap (7). Inspect square
ring (42) for damage or cuts. Remove the upper motor bolts
and lift upper end bell from motor (1).
Examine upper bearing (3) and replace if required. If
replacement is required, remove bearing (3) from motor shaft
using a wheel puller. Remove the nuts (38) and lockwashers
(36) from lower motor studs (37).
Vertically lift stator. Inspect winding for shorts and resistance.
To test the temperature sensor, check for continuity between
the black and white wires. If found to be defective contact a
motor service station or Barnes Pumps service department.
Pull motor rotor and lower bearing (47) vertically from bearing
bracket (21). Examine bearing (47) and replace if required.
If replacement is required, remove bearing (47) from motor
shaft using a wheel puller. Check rotor for wear.
If rotor or the stator windings are defective, the complete
motor must be replaced. While disassembled, check moisture
sensor wires (16), that they are secured to electrodes (18)
with lockwashers (15) and screws (14).
IMPORTANT ! - All parts must be clean before
reassembly.
F-3.2) Reassembly:
Bearings -
When replacing bearings, be careful not to
damage the rotor or shaft threads. (If so equipped, Fill Notch
should face the rotor core for both upper and lower bearings.)
Clean the shaft thoroughly. Apply adhesive compound to
the shaft and press bearing (47) on the motor shaft, position
squarely onto the shaft applying force to the inner race of the
bearing only, until bearing seats against shoulder of the shaft.
Reassemble top bearing (3) in the same manner.
Motor -
Slide lower bearing (47) and motor rotor squarely into
the bearing bracket (21) until bearing seats on the bottom.
Position motor housing and stator into pilot, aligning studs
(37) with holes in bearing bracket (21). Apply thread locking
compound on studs (37) and position washers (36) and nuts
(38) on studs (37) and tighten. Torque nuts (38) to 18 ft. lbs.
Position upper motor end bell aligning holes and thread cap
screws into motor. Torque to 16 ft. lbs. Place all motor leads
above the motor. Position square ring (42) over bearing
bracket (21) and lower housing (2) over motor and into pilot.
Apply thread locking compound to cap screws (19) threads
and install with nut (20). Torque to 24 ft. lbs.
F-3.3) Wiring Connections:
Check power cable (10A) and control cable (10D), on conduit
box (10), for cracks or damage and replace complete conduit
box assembly (10) if required (see Fig. 4). Bring motor wires
through wire opening in top of housing (2),check sleeving (53)
and replace if required, position square ring (11) in conduit
housing (10) and reconnect motor leads to power cable and
moisture and temperature sensor leads to control cable using
connectors (12), (17) and insulators (54) as show in Fig. 3.
Manual Index
