This page is the ordering reference: an aftermarket-compatible replacement for the Lincoln 85569 FlowMaster II electric grease pump, a 24V DC pail-mounted unit, 2,500 PSI maximum pressure. IsoHiTech supplies aftermarket-compatible components. Brand names are used for compatibility reference only. IsoHiTech is not an authorized OEM dealer.
How the Pump Works
The pump is a positive-displacement, double-acting unit that delivers grease on both strokes. A two-stage planetary gear set, 17.8:1, drives the pump element from a 24V DC motor with integrated 9.5-100 RPM speed control. It bolts to a 4-bolt drum cover and works from a 5-gallon (18 L / 35 lb) pail. It feeds single-line lubrication circuits; for divider-valve systems see progressive lubrication systems.
Specifications
| Item | Specification |
|---|---|
| Motor | 24V DC, 1/3 HP (0.25 kW), polarity sensitive – red lead to positive |
| Operating range | 18-32V; motor shuts off outside this band |
| Circuit protection | 5 A fuse recommended |
| Gear set | Two-stage planetary, 17.8:1 ratio |
| Speed | Variable, 9.5-100 RPM, integrated speed control |
| Output | 0.7-6.3 cu in/min (11.5-103 cc/min); falls as grease stiffens in the cold |
| Maximum pressure | 2,500 PSI (172 bar); no built-in high-pressure shut-off – external relief valve required |
| Outlets | Dual 1/4″ NPTF female, opposite sides: one for supply, one for the relief valve |
| Pumping action | Positive-displacement, double-acting (delivers on both strokes) |
| Mounting | 4-bolt drum-cover mount |
| Reservoir | None of its own; works from a 5-gallon (18 L / 35 lb) pail |
| Lubricants | Grease up to NLGI Grade 2; industrial oils |
| Operating temperature | -40°C to +66°C |
| Weight | 30 lb (13.3 kg) |
Identifying the Unit You Are Replacing
Confirm the unit on your machine matches this profile before ordering: a nameplate with the model number and a 24V DC rating, a 4-bolt drum-cover mount, a 5-gallon 35 lb pail, and two 1/4″ NPTF female outlets on opposite sides, one feeding supply and the other taking the relief valve. If all of that agrees, this page is the right ordering reference; if any item differs, confirm the configuration before ordering.
What the Replacement Covers
The replacement is the pump unit alone. It does not include the drum cover, follower plate, relief valve, or tubing and fittings; those carry over or are ordered separately. Confirm the complete configuration – mount, outlet threads, relief valve, electrical hookup – before ordering. Photos of the nameplate and current installation get the fastest confirmed match: contact us for a quote.
Running It With Your Existing System
Check these points before installing on an existing controller, harness, and low-level switch setup:
- Supply: 24V DC feed; the motor runs in the 18-32V band and shuts off outside it.
- Polarity: red lead to positive – the motor is polarity sensitive.
- Protection: a 5 A fuse on the feed.
- Outlets: 1/4″ NPTF female ports – existing line and relief-valve connections thread straight on.
- Lubricant: grease up to NLGI Grade 2, or industrial oils.
- Pressure: no built-in high-pressure shut-off – an external relief valve in the system is required, not optional.
Output, Speed, and Cold Weather
Output runs 0.7-6.3 cu in/min (11.5-103 cc/min) across the 9.5-100 RPM range. Output falls as grease stiffens in the cold – a cold pail of NLGI 2 delivers less than the headline figure until it warms. This page does not publish a full temperature-output chart; if cold-start output matters, plan on the low end of the range.
Failure Points and Repair or Replace
Failures in 24V pail-mounted units usually come from a short list: a worn motor that draws excess current, runs hot, or fails to start; a tired pump element that loses output even at full speed; leaking seals that let grease weep and air into the inlet; a blocked strainer that starves the pump and mimics element wear. Where internal wear parts are unavailable, a replacement pump is the practical route. Keep the diagnosis separate from the buying decision.
Frequently Asked Questions
What is the Lincoln 85569 FlowMaster II replacement on this page?
An aftermarket-compatible replacement for the Lincoln 85569 FlowMaster II: a 24V DC electric grease pump rated at 2,500 PSI maximum pressure, 0.7-6.3 cu in/min output from a 5-gallon pail.
Is it a genuine Lincoln unit?
No. It is an aftermarket-compatible equivalent supplied by IsoHiTech for this configuration, not a factory-original unit; the brand name identifies which unit the replacement fits.
Will it run with my existing controller, harness, and low-level switch?
Yes in most 24V setups, if you match four things: 18-32V supply, correct polarity (red lead to positive), a 5 A fuse, and the 1/4″ NPTF threads. This page does not verify every harness or controller variant – check your nameplate and lead markings first.
What voltage does it need?
24V DC, operating range 18-32V; the motor shuts off outside that band. Red lead to positive; 5 A fuse on the feed.
What pressure does it deliver, and does it need a relief valve?
2,500 PSI (172 bar) maximum. No built-in high-pressure shut-off – an external relief valve in the system is required; one 1/4″ NPTF outlet exists for it.
What reservoir does it use?
None of its own – it mounts on a 4-bolt drum cover and works from a 5-gallon (18 L / 35 lb) pail.
What output can I expect?
0.7-6.3 cu in/min (11.5-103 cc/min) across 9.5-100 RPM; output falls when cold grease stiffens.
Repair or replace: how should I decide?
All four failures above are repairable in principle, but where internal wear parts are unavailable a replacement unit is the practical route. Diagnose first, then decide.
What is included with the replacement?
The pump unit alone. Not included: drum cover, follower plate, relief valve, tubing, and fittings – those carry over or are ordered separately.
Related Pages
- P203 grease pump
- Lincoln Vogel KFGS piston pump
- Electric grease pump
- Grease pump
- Progressive lubrication systems
To confirm the configuration and get current availability, contact us for a quote.
