Lincoln FlowMaster II Rotary Driven Hydraulic Pump
Lincoln FlowMaster II Rotary Driven Hydraulic Pump — Model 85733
Item Overview
This is a new, factory-sealed Lincoln FlowMaster II Model 85733 rotary driven hydraulic pump assembly, assembled in the USA by Lincoln Industrial (an SKF Group brand), purchased in June 2024 and stored as a spare at Syncrude Canada Ltd.'s oil sands operations. The unit weighs 120 lbs (54 kg) and is complete in the original Lincoln OEM carton with the hydraulic motor assembly, follower plate, pump tube, and all hardware. The SKF/Lincoln user and maintenance manual (Form 404554, Version 6, February 2023) is included.
The pump head bears Lincoln's motor plate P/N 277400, serial number 23823 4620, Made in USA, confirming this is a current-production unit.
What is the FlowMaster II?
The Lincoln FlowMaster II is a fully hydraulically operated, adjustable-output grease pump designed for use with Lincoln Centro-Matic centralized lubrication systems — the industry-standard automatic lubrication system used on mining trucks, shovels, draglines, and heavy construction equipment worldwide. The pump mounts directly into a 120 lb (54 kg) grease drum and is driven by the machine's existing hydraulic system, requiring no separate electric motor or air supply.
Technical Specifications
| Attribute | Value |
| Model | 85733 |
| Drum Size | 120 lb (54 kg) |
| Drive Type | Rotary hydraulic motor |
| Max Supply Hydraulic Pressure | 3,000 PSIG (200 bar) |
| Operating Working Hydraulic Pressure | 300–450 PSIG (20–32 bar) |
| Hydraulic Inlet Flow | Up to 7 GPM (28 l/min) |
| Pump Ratio (with manifold) | 9:1 at low inlet pressure (300–350 psi) / up to 11:1 at higher inlet pressure and flow |
| Max Hydraulic Fluid Temperature | 200°F (93°C) |
| Operating Temperature | -20°F to +150°F (-10°C to +65°C) |
| Operating Voltage (solenoid) | 24 V DC |
| Hydraulic Inlet Port | 3/8 NPTF |
| Tank Return Port | 3/8 NPTF |
| Pump Outlets | 1/4 NPTF |
| Weight | 120 lbs (54 kg) |
| Assembly Location | Assembled in USA from imported and domestic parts |
| Motor P/N | 277400 |
| Motor Serial | 23823 4620 |
Typical Applications
The Lincoln 85733 FlowMaster II is the standard hydraulic grease pump used in Lincoln Centro-Matic automatic lubrication systems on:
•CAT mining trucks: 793, 795, 797 and related haul truck platforms
•Komatsu haul trucks: 830E, 860E, 930E
•P&H and Bucyrus electric rope shovels
•Liebherr and Hitachi mining equipment
•Any heavy equipment equipped with a Lincoln Centro-Matic or SL-1 centralized lubrication system using a 120 lb drum pump
The 120 lb drum configuration (Model 85733) is the most common size used on large mining haul trucks and shovels, where high grease consumption demands a large reservoir.