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11. INSTRUCTIONS FOR PUMP ASSEMBLY
Refer to Section 14, PARTS LIST.
Refer to Section 5, DIRECTION OF ROTATION AND RELIEF VALVES, to assure proper configuration for pump
rotation, port location, and relief valve position prior to assembling pump.
1. Read and understand all safety instructions and warnings before assembling pump. Visually inspect all
parts during assembly. Replace all worn or damaged parts. Although they may appear reusable, it is
recommended that new gaskets (20, 22, 25) and lip seals (5, 39) be installed when pump is being
reassembled.
WARNING! Only use genuine Roper gaskets. Gasket thickness determines proper clearances.
Always check quantity of gaskets removed and replace with exact quantity. Proper material must be
used based on application.
2. When cleaning or lubricating, only use products that are compatible with product being pumped and
elastomers within pump. DO NOT use petroleum base products with seals with EPR elastomers. Clean
and lubricate parts with light oil unless EPR elastomers are used. Use a non-petroleum base lubricant
with EPR elastomers.
3. Mechanical seals are precision pieces of equipment. Use extreme care not to damage seal faces or
elastomers during assembly.
4. Install two hollow dowel pins (J) on each side of case (19A, B, C, D, E). Place appropriate number of case
gaskets (20) on faceplate side of case. Align faceplate (23A, B, C,) on hollow dowel pins (J). Secure
faceplate to case using two washer head cap screws (K) and eight hex head cap screws (L).
5. Place idler gear (35) into case bore. Install key (B) in keyway on idler shaft (33). Slide idler shaft into I.D.
of idler gear.
6. A.) For 3500/4500 “BH” pumps with triple lip seal, follow steps 7 – 13.
B.) For 3500/4500 “HB” and 3522 “SBFO” pumps with triple lip seal, follow steps 14 – 26.
C.) For 3600/4600 “BH” pumps with shaft packing, follow steps 27 – 36.
D.) For 3600/4600 “HB” and 3622 “SBFO” pumps with shaft packing, follow steps 37 – 46.
E.) For 3700/4700 “BH” pumps with standard mechanical seal, follow steps 47 – 55.
F.) For 3700/4700 “BH” pumps with positive drive mechanical seal, follow steps 56 – 70.
G.) For 3700/4700 “HB” and 3722 “SBFO” pumps with standard mechanical seal, follow steps 71 – 79.
H.) For 3700/4700 “HB” and 3722 “SBFO” pumps with positive drive mechanical seal,
follow steps 80 – 94.
3500/4500 “BH” Pumps (See Figure 14.1)
7. Install backplate end retaining ring (36A) on drive shaft (32). Install key (B) on drive shaft. Slide drive
gear (34) onto drive shaft. Install faceplate end retaining ring (36B) on drive shaft to secure drive gear.
8. Place appropriate number of case gaskets (20) on backplate side of case (19A, B, C, D, E). Slide drive
gear (34) assembled with drive shaft (32), and backplate (6a, B) into case bore. Align backplate (6A, B)
on hollow dowel pins (J). Secure backplate (6A, B) to case (19A, B, C, D, E) using two washer head cap
screws (K) and eight hex head cap screws (L).
9. Lubricate drive end of drive shaft (32) and triple lip seal (10) with a light oil. Slide triple lip seal over shaft
with two lips facing toward pump gears (33, 34). Gently push seal past tapered area of shaft and down to
front of seal chamber. Press triple lip seal into bore until back side is flush with face of seal chamber.
Take care to use a tool that will not damage or distort seal casing. Install one packing washer (18).
10. Place one square head bolt (G) through each slot in backplate (6A, B) and through each hole in seal
retainer (9). Using two locknuts (F), secure seal retainer in place.
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