Specifications

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, if applicable, 38, 48, 50) 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 nonpetroleum 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 3600/4600 “BH” pumps with shaft packing, follow steps 7 – 16.
B.) For 3600/4600 “HB” and 3622 “SBFO” pumps with shaft packing, follow steps 17 – 26.
C.) For 3700/4700 “BH” pumps with a standard mechanical seal, follow steps 27 – 35.
D.) For 3700/4700 “BH” pumps with a positive drive mechanical seal, follow steps 36 – 50.
E.) For 3700/4700 “HB” and 3722 “SBFO” pumps with a standard mechanical seal, follow
steps 51 – 59.
F.) For 3700/4700 “HB” and 3722 “SBFO” pumps with a positive drive mechanical seal, follow
steps 60 – 74.
3600/4600 “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. Install packing washer (18) over drive shaft (32) and into packing bore of backplate (6A, B).
10. Install packing rings (16) and lantern ring (17), if used, in backplate bore. Stagger joints on each packing
ring 180° apart. Seat each ring before adding next ring. Rings must not be tamped or seated too tightly.
11. Check drive shaft (32) for free movement after each ring is installed.
12. When packing box is sufficiently full to allow entry of packing gland (14) about ¼ of an inch [6 mm],
reassemble packing gland.
13. Install studs (AG) into backplate (6A, B). Insert packing gland (14) into packing box about ¼ of and inch
[6 mm]. Slide packing gland clip (13) over studs (AG). Using two locknuts (F), secure packing gland (14) in
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