BLACKMER EBSRAY RC20, Installation, Operation And Maintenance Instructions

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551-A00 Page 8/21
MAINTENANCE
NOTICE:
Maintenance shall be performed by qualified technicians
only, following the appropriate procedures and warnings as
presented in this manual.
Most maintenance tasks and inspections can be performed with
the pump ‘in line’ so long as complete electrical isolation,
depressurizing and purging procedures have been completed.
TO REPLACE MECHANICAL SEAL ONLY
1. Follow steps 3, 4, 6, and 7 in PUMP DISASSEMBLY.
2. Inspect relevant components as described in 'INSPECTION'
and repair or replace as required.
Then follow steps 14 to 16 in 'REASSEMBLY’.
PUMP DISASSEMBLY
NOTICE:
Follow all hazard warnings and instructions provided in
the “Pump Maintenance” section of this manual.
Refer to ‘PARTS DESIGNATION’
1. Drain and relieve pressure from the pump and system as
required.
2. Remove Motor, Coupling Guards (37), Pump Coupling half
(36P)and Pump Shaft Key (34).
3. Remove Cover (2), Impeller (3) and Impeller Key (8). The
Coupling Guard retaining screws (37A) may be screwed into
the Impeller to aid removal.
4. Fig. 2
Unscrew four setscrews (57A)
from Cartridge (57).
5. Insert setscrews into the two
extraction holes and screw in
evenly to extract the Shaft
Assembly.
Fig 3
Complete Shaft Assembly
6. Fig. 4
Remove Circlip (58) from
end of Shaft Assembly.
Remove Mechanical Seal
Assembly (56). The
Coupling Guard retaining
screws (37) may be
screwed into the Impeller
and/or Seal Assembly to
aid removal.
7. Fig 5
Remove Carbon Seal Seat
(40) and Lip Seal (55) from
Cartridge.
8. Remove Circlip (25) and press Bearings (23, 24) from Shaft.
9. Remove Dust Seal – Bearing (33) from Body.
INSPECTION
1. Fig. 6
Check Impeller and
Seal Zone of Body
for damage or wear.
Replace Impeller if
blades have been
damaged or wear
exceeds minimum
recommended
dimensions.
MINIMUM IMPELLER DIMENSIONS
Pump Model RC20 RC25 RC40
Minimum worn
width 0.349”
8.86 mm 0.388”
9.86 mm 0.585”
14.86 mm
Minimum worn
diameter 4.325”
109.86 mm 4.325”
109.86 mm 4.640”
117.86 mm
2. Check Shaft (21) for wear, damage or run-out. Replace as
required.
3. Inspect both Ball Bearings (23, 24) for wear. It is
recommended on major overhauls that Ball Bearings be
replaced.
Bearing Replacement recommended not exceeding
10,000 operational hours.
4. Check Mechanical Seal components for wear or damage. It
is recommended on major overhauls that Mechanical Seal
components be replaced.
5. It is recommended that all O-Rings be replaced at every
overhaul or when any disassembly is conducted.
3. Follow steps 1 to 6 in 'PUMP ASSEMBLY’.
Fit Cartridge to Body before fitting and securing Mechanical
Seal Assembly as shown in Fig 13