Zenith Pumps ® B-Series Gear Pumps Installation, Care and Maintenance Zenith Chemical Duty Gear Pumps ®
Thoroughly read and understand this entire manual before installation and operation of pump. ® Zenith ® In 1926, Zenith was approached by the synthetic fiber industry to design a pump to provide a precise, pulseless, repeatable flow and assure better quality control. The options then were the same as those in the chemical process industry today — diaphragm, lobe, coarse gear, piston, plunger and screw pumps.
Design The B-Series pumps are constructed from cutlery grade 420 and 440C stainless steel. The pumps consist of two or three gears rotating in mesh within a closely fitted housing that is comprised of three plates. The center or gear plate fits closely around the outside diameter of the metering gears. The front and rear plates sandwich the gear plate and restrict axial movement of the gears. In the BPB, BMB, BLB, and BXB series, the gear set is comprised of a driving and a driven gear.
Operation In the trunnion-ported BPB, BMB and BMC pumps, fluid enters the pump at the outer drive gear side of the pump. A passage has been drilled from the inlet port up through the front plate into the center plate gear pocket. Fluid flows into the gear pocket and fills the gear tooth volumes. As the gears rotate, the fluid is transported around the outer diameter of the gear pocket to the discharge side.
Installation Pumps should be carefully unpacked and checked to make sure that the shipment is complete. If any items are missing or damaged, the freight carrier and Zenith should be notified immediately. The following is a general installation procedure. For special applications, considerations, or simply to ask for advice, please contact our Applications Engineering Group. It is not recommended to flush downstream process equipment utilizing Zenith precision metering pumps.
Cleaning, Inspection and Repair Lapping Or Blocking ® Zenith metering pumps are made for exacting duty. All parts are machined to extreme accuracy; critical dimensions are held between one and two tenthousandths of an inch (.0001"/.0002"). Accurate performance is dependent upon proper handling. Please treat them with care, and if it’s at all possible, set aside a separate clean area for pump maintenance.
BPB Series Disassembly Refer to Diagram 1 on Page 10 (general reference only). Note: As parts are disassembled, place them carefully on a clean surface such as a soft cloth. Do not allow them to knock together. 1) Remove Outer Drive Gear (18) by first removing Drive Strap Screws (28) and Drive Strap (20). Slide Yoke Retainer (19) out of slot in Hub (12). 2) Pull Outer Drive Shaft (11) out of Hub (12). 3a) LIP SEAL DESIGN. Place pump in a soft-jawed vise with the Hub (12) facing upward.
BPB Series Assembly Considerable care should be taken to prevent wedging or jamming. Never force the parts together. They will drop into place if properly aligned. 1) Provide a can of clean oil, preferably SAE-50 motor oil or mineral oil. 2) Press Arbor (5) and Dowels (10) into Rear Side Plate (3) using the Driven Metering Gear (7) as a guide for press-ing the arbor upright and perpendicular to the plate. See Figure 2. 3) Install Port Seal Screws (23 & 25) in both plates with new Gaskets (22 & 24).
BPB Series Assembly (continued) 22) Place Outer Drive Shaft (11) into Hub (12) (when applicable), and rotate until Drive Shaft (4) and Outer Drive Shaft (11) mate. 23) Place Outer Drive Gear (18) over Hub (12), insert Yoke Retainers (19) into appropriate grooves followed by Drive Strap (20) and tighten down with Drive Strap Screws (28). 24) Pour oil into inlet port to lubricate internal components, then rotate pump to check for free rotation. 25) Apply standard gun grease to Grease Fitting (26).
BPB Series Diagram 1 BMB/BMC Series Diagram 2 10
BLB Series Diagram 3 BXB Series Diagram 4 11
BMB/BMC Series Disassembly Refer to Diagram 2 on Page 10. Note: As parts are disassembled, place them carefully on a clean surface such as a soft cloth. Do not allow them to knock together. 1) Remove Outer Drive Gear (2) by first unscrewing the two #10-24 Drive Strap Screws (32). Remove Drive Strap (31) and Retaining Rings (30) from Drive Shaft (8). 2) Remove Seal Plate (16) by unscrewing three #10-24 x 1/2" Seal Plate Screws (20).
BMB/BMC Series Assembly Considerable care should be taken to prevent wedging or jamming. Never force the parts together. They will drop into place if properly aligned. 1) Provide a can of clean oil, preferably SAE-50 motor oil or mineral oil. 2) Fix Body (1) in a bench vise, inside face up. Install Port Seal Screws (24 & 26) with new Gaskets (25 & 27). 3) Lubricate Arbors (10).
BLB Series Disassembly 14 Refer to Diagram 3 on Page 11. Note: As parts are disassembled, place them carefully on a clean surface such as a soft cloth. Do not allow them to knock together. 1) Remove Drive Strap Screws (28) and Drive Strap (20). Remove Seal Plate Screws (41) and Seal Plate (19) and remove the Outer Drive Gear (1). 2) Remove Seal Housing (13) and Lip Seals (14) in the housing. In all cases we strongly advise removing and discarding used Lip Seals (14).
BLB Series Assembly Considerable care should be taken to prevent wedging or jamming. Never force parts together. They will drop into place if properly aligned. 1) Provide a can of clean oil, preferably SAE-50 motor oil or mineral oil. 2) Using the Driven Metering Gear (7) as an upright guide, press the Arbor (9), using an arbor press, into the Front Side Plate (2) until flush with the outside of the plate. Apply a light film of oil to the Arbor (9) before pressing it into the plate.
BXB Series Disassembly 16 Refer to Diagram 4 on page 11. Note: As parts are disassembled, place them carefully on a clean surface such as a soft cloth. Do not allow them to knock together. 1) Remove the Key (17) from the end of the Drive Shaft. 2) Remove the Seal Plate Screws (20). 3) Slide the Seal Plates (13) and Flush Plate (14) over the end of the shaft. 4) Pry the Lip Seals (31) from the Seal Plates and discard. It is recommended that the Lip Seals be replaced anytime the pump is taken apart.
BXB Series Assembly Note: Considerable care should be taken to prevent wedging or jamming of parts. Never force parts into place. All parts should drop into place if properly aligned. During assembly, manually turn the metering gears to ensure free rotation. If binding occurs at any time, determine the cause and correct it immediately. A small nick, burr, or foreign particle may cause extensive damage to pump components. 1) Provide a can of clean oil, preferably SAE-50 motor oil or mineral oil.
“Seal Area” For BLB Lip Seal Type Pump 1) Use of a Zenith Lip Seal Installation Guide is recommended to expand the ID of the seals prior to sliding the seals down the drive shaft preventing Lip Seal damage (P/N 15-001310071-2). Install Lip Seals (14) into Seal Housing (13) as shown in Figure 12. 2) Carefully lower Seal Housing (13) over Drive Shaft (5) making sure that the grease hole in the Front Side Plate (2) coincides with the grease hole in the Seal Housing (13).
Bolt Torque Troubleshooting Size (UNC Alloy Steel) Recommended Torque (in -lbs) #10-24 64 #12-24 120 5/16-18 305 1/2-13 780 5/8-11 900 Trouble Probable Cause Remedy Pump will not turn 1) Drive malfunction Verify drive powered. Check to assure all alarm circuits are clear. Check drive motor current and speed settings. 2) Process conditions changed Check process conditions for proper temperature, pressures, viscosities and materials.
FAILURE, IMPROPER SELECTION OR IMPROPER USE OF THE PRODUCTS AND/OR SYSTEMS DESCRIBED HEREIN OR RELATED ITEMS CAN CAUSE DEATH, PERSONAL INJURY AND PROPERTY DAMAGE. WARNING This document and other information from Zenith Pumps, its subsidiaries and authorized distributors provide product and/or system options for further investigation by users having technical expertise.
