Minneapolis-Moline ZA / ZAS / ZASI
Verified
Production years: 1949–1953 (per TractorData).
The Minneapolis-Moline ZA / ZAS / ZASI is documented here with production years, manuals, and service references. Serial-number-by-year decoding for this model is pending a verified tabular source. We do not assert horsepower, engine, or production-count figures until confirmed against factory literature.
Specifications
| Nebraska Test | No. 438 (1950) |
|---|---|
| Test Dates | May 6 - May 15, 1950 |
| Fuel | Gasoline |
| Engine | Minneapolis-Moline, 4-cylinder vertical |
| Bore & Stroke | 3-5/8 in x 5 in |
| Displacement | 206 cu in |
| Rated RPM | 1500 |
| Compression Ratio | 6.19:1 |
| Carburetor | Size 1 in |
| Ignition | 6-volt battery |
| Belt HP (rated) | 31.85 hp at 1500 rpm (Test D) |
| Belt HP (maximum) | 36.20 hp at 1500 rpm (Test B) |
| Drawbar HP (maximum) | 32.07 hp, pull 2780 lb (Test F) |
| Total Weight as Tested | 5,925 lb (with operator) |
| Speeds (mph) | 1st 2.4, 2nd 3.6, 3rd 4.6, 4th 6.3, 5th 13.1, reverse 2.2 |
| Tested fuel economy | 10.16 hp·hr/gal |
Specifications per the cited source below. Manufacturer-advertised figures can differ from tested values — confirm restoration-critical specs against factory literature.
Source: Nebraska Tractor Test No. 438 (1950) — ZA / ZAS / ZASI
Nebraska Tractor Test Results
Official, independently measured performance from the University of Nebraska Tractor Test Laboratory (public-domain reports). Figures are as-tested on a specific fuel/transmission variant — your tractor may differ. Look up the full report by test number.
| Test No. | Fuel | Year | Drawbar hp (max) | PTO/Belt hp |
|---|---|---|---|---|
| 438 | Gasoline | 1950 | 32.07 hp | 36.20 hp (Belt) |
Factory Paint Colors
Body, wheel, and powertrain colors documented for this model's era by the MMCI Paint Committee. The exact part-by-part configuration, year breaks, and footnotes are in the full paint reference. Individual tractors vary — special orders and regional exceptions were common, so confirm against your own machine.
- Prairie Gold (body)
- Cherry Red (wheels / trim)
Finding Parts
We don't publish part numbers we can't verify against factory literature. The authority for this model's part numbers is its factory parts catalog; interchange is serial- and configuration-dependent, so always confirm against the parts book before buying.
Documented parts
Cataloged Minneapolis-Moline part numbers documented for this model. Applications vary by serial, year, and configuration — confirm against your parts book before ordering.
Bearing
Belt
- RE684 — Fan & water-pump belt
Carburetor
- TSX-97 — Marvel-Schebler carburetor (MM# RE733C)
Clutch
- 10P355 — 10" organic clutch plate, solid center
- JT9019 — One-piece driving plate & friction discs, 63-tooth
- 10A3743 — Pressure plate, 11", three levers, 9 springs
Decal
Engine Bearing
- EE5353 — Rear main bearing, standard (206 engine)
- 10A8420 — Rod bearing set, standard (206B-4 engine)
General
- 10A2071 — Ignition & light switch w/ handle (no magneto)
Hose
- 10A326 — Upper radiator hose
Oil Filter
- RE5599 — Oil filter
Piston
- 60P36462360 — 3.625"+0.020 aluminum piston w/ pin, rings, retainers
- 60P36862360 — 3.625"+0.040" aluminum piston
- 60P38002363 — 3.8" bore 700-gram forged racing piston & HP pin
- 2-10R795 — Four sets of 0.040" over-rings for 10R792 piston
- 60R3686 — Ring set (3.625"+0.040")
- 60R3646 — Ring set for 60P36462360 piston
Seal
- 10A21466 — Rear Engine Crankshaft Seal
Implements & Attachments
Documented Minneapolis-Moline implements/attachments used with this model. Fitment is configuration-dependent — confirm against factory literature.
Surviving Examples (collector-reported census)
Owner-submitted survivors, reviewed before publishing. Collector-reported — these corroborate, but do not establish, the documented serial ranges above.
- 1 known survivor
- Serials observed: 64,901,929–64,901,929
- 1 state/province, 1 country
Add your ZA / ZAS / ZASI to the registry → Browse the full census →
Sources & Verification Notes
Status: Verified
Primary source: TractorData — Minneapolis-Moline model listings tier 4
Last checked: 2026-05-31
Where this model fits in the Minneapolis-Moline history & timeline →
Videos
Minneapolis Moline ZAS model Z Tractor, SOLD Aug. 17, 2011 Tractor Town
Plowing with a Minneapolis Moline ZA tractor and a MM AF 2-16” plow. #antiquetractors #plo Everything Moldboard Plows - John GaardCurated third-party videos — MinnieMo is not affiliated; links open on YouTube.
Owner Notes & Questions
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