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12. INSTRUCTIONS FOR DISASSEMBLY OF A TYPE “MBH”
HYDRAULIC DRIVE
Refer to Section 14, PARTS LIST.
1. Read and understand all safety instructions and warnings before starting to disassemble hydraulic drive
components from pump. While disassembling, always inspect disassembled parts and adjacent parts to
see if further disassembly is needed. Replace worn or damaged parts as required.
2. Turn off pump and lock out energy source to hydraulic motor. DO NOT proceed further with disassembly
of the pump if there is the slightest possibility that the hydraulic motor may be started.
3. Close inlet and discharge valves.
4. If pump is to be disassembled:
A.) Refer to Figure 14.1, pump sectional drawing for “BHFRV” and Figure 14.3, “MBH” HYDRAULIC
DRIVE COUPLING ASSEMBLY.
B.) If used, turn off and disconnect flush for packing or mechanical seal.
C.) To drain pump, follow the procedures in Section 7, INSTRUCTIONS FOR DRAINING PUMP.
D.) Disconnect lines from pump inlet and discharge.
5. Remove two cap screws securing hydraulic motor to bracket (61).
6. Slide hydraulic motor out of bracket. The rigid coupling (62) is a slip fit on both shafts; therefore, it may
remain on pump shaft or motor shaft.
7. Remove four socket head cap screws (64) securing bracket (61) to backplate (6A, B). Remove bracket.
8. For further disassembly of the pump, refer to Section 8, INSTRUCTIONS FOR PUMP DISASSEMBLY,
steps 1 – 20. Also, refer to steps 21 – 24 for pumps with triple lip seal, steps 31 – 34 for pumps with
packing, or steps 41 – 44 for pumps with mechanical seals.
13. INSTRUCTIONS FOR ASSEMBLY OF A TYPE “MBH”
HYDRAULIC DRIVE
1. Refer to Section 14, PARTS LIST, for 3500-4700 “BHFRV” for pump assembly. If pump requires
assembly, refer to Section 11, INSTRUCTIONS FOR PUMP ASSEMBLY, steps 1 – 6. Also, refer to
steps 7 – 13 for pumps with triple lip seal, steps 27 – 36 for pumps with packing, or steps 47 – 70 for
pumps with mechanical seals.
2. Refer to Figure 14.3, “MBH” HYDRAULIC DRIVE COUPLING ASSEMBLY for assembly of bracket and
coupling.
3. Install retaining ring (63) in rigid coupling (62).
4. Install key (Z) in pump shaft keyway. Slide rigid coupling (62) onto shaft until end of the shaft is against
retaining ring (63).
5. Place bracket (61) onto pilot of backplate (6A, B). Secure bracket with four socket head cap
screws (64).
6. Slide rigid coupling (62) back until outboard end of coupling is even with outboard end of bracket (61).
7. Install key in hydraulic motor shaft. Line up shaft key and rigid coupling keyway and slide units together.
Rotate hydraulic motor to align motor mounting holes and secure motor with two or four cap screws as
required.
8. Read and understand all safety instructions and warnings before installing and operating pump.
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