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8. INSTRUCTIONS FOR PUMP DISASSEMBLY
Refer to Section 14, PARTS LIST.
1) Read and understand all safety instructions and warnings before starting to disassemble pump. While
disassembling pump, always inspect disassembled parts and adjacent parts to see if further disassembly is
needed. Replace worn or damaged parts as required.
2) If you do not know which pump arrangement you have, collect nameplate data and refer to Section 1,
NAMEPLATE DATA, to determine what you have. Consult a Roper distributor or Roper Pump Company if you
have any questions.
3) When cleaning or lubricating, use only cleaning solutions and lubricants that are compatible with products
being pumped and with sealing elastomers. DO NOT use petroleum base products with seals with EPR
elastomers. Use a non-petroleum base lubricant with EPR elastomers.
4) Turn off pump and lock out energy source to driver. DO NOT proceed further with disassembly of pump if
there is the slightest possibility that driver may be started.
5) If used, turn off and disconnect flush from mechanical seal.
6) Close inlet and discharge valves.
7) Remove guard and disconnect coupling between driver and pump.
8) Drain inlet and discharge lines. Disconnect lines from pump inlet and discharge.
9) Follow the procedure in Section 7, INSTRUCTIONS FOR DRAINING PUMP.
10) A.) For 3500/3600/3700/4500/4600/4700 “HB” and “SBFO” pumps, follow steps 11 – 20.
B.) For 3700/4700 “BH” pumps, go to Section 12, INSTRUCTIONS FOR DISASSEMBLY OF A TYPE
“MBH” HYDRAULIC DRIVE. After disassembling hydraulic drive, return to this section and follow steps 11 –
20.
11. Remove two washer head cap screws (K) and eight hex head cap screws (L) securing faceplate (23A, B, C,
D) to case (19A, B, C, D, E). Remove faceplate (23A, B, C, D).
12. Remove two dowel pins (J) from case.
13. Remove case gaskets (20).
14. A.) On “BH” pumps, remove faceplate end retaining ring (36B) from drive shaft (32). Remove drive gear (34)
and key (B). Remove backplate end retaining ring (36A).
B.) On “HB” and “SBF” pumps, remove drive gear (34) and key (B) from drive shaft (32).
15. Remove idler gear (35) and key (B) from idler shaft (33). Remove idler shaft.
16. Remove two washer head cap screws (K) and eight hex head cap screws (L) securing backplate (6A, B) to
case (19A, B, C, D, E) and separate parts.
17. Remove case gaskets (20) from opposite side of case (19A, B, C, D, E).
18. Remove two dowel pins (J) from opposite side of case (19A, B, C, D, E).
19. Remove drive key (A) from drive shaft (32).
20. A.) For 3500/4500 “BH” pumps, follow steps 21 – 24.
B.) For 3500/4500 “HB” pumps, follow steps 25 – 30.
C.) For 3600/4600 “BH” pumps, follow steps 31 – 34.
D.) For 3600/4600 “HB” and 3622 “SBFO” pumps, follow steps 35 – 40.
E.) For 3700/4700 “BH” pumps, follow steps 41 - 44.
F.) For 3700/4700 “HB” and “SBFO” pumps, follow steps 45 – 50.
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