Ace model numbers look like alphabet soup, but every chunk means something you need when you order parts: which shaft seal is in it, what size the ports are, what the body is made of, how it’s driven, how much oil the hydraulic motor wants, and what impeller it has. Read it left to right. Or type it into the Pump Finder and it will pull up that exact pump’s parts, kits and troubleshooting.
1. The prefix: pump family and shaft seal
| Prefix | What it means | Shaft seal / pump kit |
|---|---|---|
| FMC | Standard centrifugal pump | Carbon/ceramic Viton seal BAC-7V; kits RK-FMC or RK-FMC-150 |
| FMCSC | Same pump with a silicon carbide shaft seal (longer life in abrasive mixes) | BAC-7SC; kits RK-FMCSC or RK-FMCSC-150 |
| FMCWS | Wet seal pump (seal runs in a barrier-fluid reservoir) | Wet seal kit, e.g. RK-FMCWS-PRO5 for the 155 Pro5 models |
| FMCB | Buna seal version | Seal differs from Ace’s standard sheet; call to confirm |
| PTOC | PTO belt-drive pump | Pump seal per the size; belt, pulley and idler parts listed separately |
| GE / GESC | Gas engine pump (engine named in the model, e.g. -HONDA, -KOHLER) | Engine service is the engine dealer’s; pump parts are Ace’s |
| RP | Roller pump | Universal kit, e.g. RK-RP-800 for 8-roller models |
The seal is the single most common reason people look up an Ace model, and the prefix is where it hides. An FMC and an FMCSC with the same numbers look identical from the outside; the shaft seals and repair kits are different.
2. The size number
The number after the prefix is the pump frame and port size. The common ones: 75 is the small 1" x 3/4" poly pump, 150 is 1-1/2" x 1-1/4", and 200 is 2" x 1-1/2". No number at all (FMC-HYD-206) is the 1-1/4" x 1" pump. The 650, 750, 755 and 855 frames are the high-flow pumps with flanged 220/300 ports. The size picks the impeller, volute and pump repair kit, so it matters as much as the prefix.
3. Letters right after the size: ports and body
- F — flanged ports (FMC-150F), which means a flanged volute instead of NPT threads.
- FS or SS right after the size (FMC-150FS, FMC-200SS) — 316 stainless steel body.
- SP — self-priming volute (FMC-150SP). On the small 75 and 85 pumps the SP models are also poly.
- BSP — British (BSPP) threaded ports instead of NPT.
With none of those, the body is cast iron (e-coated on newer pumps), except the poly 75/85 pumps.
4. The drive
HYD is a hydraulic motor drive, MAG an electric clutch (MAG-D, MAG-DX), and CW means clockwise rotation. LM means “less motor”: the pump is set up for a hydraulic motor but ships without one, so there are no motor parts to list.
5. The hydraulic motor number
On a HYD pump the next number is the hydraulic motor, and it tells you how much oil the motor is built for. That’s the number to match to your tractor (see matching a hydraulic pump to your tractor).
| Motor | Oil flow (per Ace sheets) | Motor repair kit |
|---|---|---|
| 204 | About 4 GPM | RK-BAC-75-HYD-L |
| 206 | About 7 GPM | RK-BAC-75-HYD-L |
| 210 | About 10 GPM | RK-BAC-75-HYD-L |
| 304 | About 9–11 GPM depending on the pump | RK-BAC-75-HYD-300-L |
| 306 | About 16.5 GPM | RK-BAC-75-HYD-300-L |
| 307 | 16–19 GPM | RK-BAC-75-HYD-300-L |
| 310 | 16–25 GPM | Call to confirm the 310 kit |
| M16 / M22 / M25 | M-series pressure-plated gear motors, roughly 14.5–20 GPM | RK-BAC-75-M |
Letters on the motor number: N = motor only, no external fittings (206N); CD = case drain (needs a third line back to the reservoir); PWM = integrated PWM control valve for closed-center systems; R = reverse rotation; LS = flow limiting valve; 8SAE / 10SAE / 12SAE = the SAE size of the motor’s oil ports.
6. The suffixes at the end
- CI — cast iron impeller
- PI — polypropylene impeller
- SI — 316 stainless steel impeller
- SS at the end — stainless construction and hardware. Not the same as a stainless body; that’s FS or SS right after the size.
- EC — e-coated finish
No impeller suffix means the standard Valox (engineering plastic) impeller.
Putting it together
FMCSC-150FS-HYD-206-CI is a silicon carbide seal pump (kit RK-FMCSC-150), 1-1/2" x 1-1/4" with flanged ports, a 316 stainless body, a 7 GPM 200-series hydraulic motor (motor kit RK-BAC-75-HYD-L), and a cast iron impeller. FMC-200-HYD-304 is a standard-seal 2" x 1-1/2" cast iron pump with a 300-series motor around 11 GPM and the standard impeller.
Can’t read the whole tag? Answer the questions in the Pump Finder (brand, pump type, body material, drive, port size) and pick yours from the list, or call (509) 838-2209.
Spray Center Electronics stocks pump parts and repair kits for Ace, Banjo, Hypro/SHURflo and Annovi Reverberi (AR) pumps in Spokane, WA. Part numbers here come from the manufacturers’ parts sheets; when your pump has been modified or the tag is gone, send a photo to sales@spraycenter.com or call (509) 838-2209 and we’ll match it before you order.