Tandem Gear Pump Assembly
DISASSEMBLE 1. Secure the tandem gear pump assembly in a vise. Put an alignment mark on each section of the pump body to aid in reassembly. NOTE: The tandem gear pump assembly consists of a driven pump attached to a drive pump. Each pump has an inlet adapter and outlet fitting. 2. Remove inlet adapters and outlet fittings from drive pump and driven pump of tandem gear pump assembly. See Figure 13.
1900 YRM 1136 3. Remove two capscrews and washers attaching driven pump to drive pump. See Figure 14. NOTE: Drive pump shaft and driven pump shaft are connected by a coupling. 4. Slowly remove driven pump from drive pump. Note position of O-rings on coupling. Remove Orings, and coupling. Discard O-rings. 5. Place driven pump on a clean work space and continue with disassembly of the drive pump. 6. Remove snap ring and oil seal from drive pump flange end housing. Discard snap ring. 7. Remove the socket head screws and washers that hold the pump together, and remove from vise. Remove adapter plate, cover plate and housing from drive pump flange end housing. DO NOT let the seals and gears fall. 8. Make a note of the position of the plate seals and pressure plates. Carefully remove the plate seals, back up seals, pressure plates, gear plate, cover plate, oil seal and gears from the housings. Discard plate seals and backup seals.
1. FITTING 2. DRIVEN PUMP
3. ADAPTER 4. DRIVE PUMP
Figure 13. Tandem Gear Pump Fittings
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