Z900 Series Diesel Zero Turn Mowers

Z997R DIESEL MOWER

37.4 HP (27.5 kW)
Biodiesel (B20) compatible
Tier 4 compliant
7-Iron PRO deck
Rear Discharge Deck Available

Z994R DIESEL MOWER

24.7 hp (18.4 kW) liquid-cooled diesel engine
ComfortGlide Suspension on all seat options
11.5 U.S. gallon fuel tank (43.5 L)
7-Iron PRO Deck
Rear Discharge Deck
Mulch On Demand Available

John Deere Z900 Diesel ZTrak Mowers

The Z994R and Z997R bring diesel power to the commercial ZTrak lineup. They are made for crews and grounds teams who mow large properties all day and want long run time between fill-ups.

Koenig Equipment sells and services Z900 diesel mowers across Ohio and Indiana. Request a quote on either model and our team will help you choose the deck for your properties.

A person operates a John Deere ZTrak ride-on mower in a large, open grassy field under a blue sky, perfectly depicting the equipment mowing a vast open area

Z994R or Z997R?

Both models use heavy 7Iron PRO decks and offer a rear-discharge FastBack PRO deck. The Z997R adds horsepower, while the Z994R adds a Mulch On Demand deck option and ComfortGlide suspension on all seat options.

Model	Engine	Fuel tank	Deck options	Speed
Z994R	Liquid-cooled 3-cylinder diesel	11.5 gal	60 or 72 in. 7Iron PRO side discharge, 60 in. Mulch On Demand, 60 or 72 in. FastBack PRO rear discharge	0 to 11.4 mph
Z997R	37.4 HP diesel, B20 compatible	12 gal	60 or 72 in. 7Iron PRO side discharge, 72 in. FastBack PRO rear discharge	0 to 11.5 mph

The Z997R carries a warranty of 36 months or 1,500 hours, whichever comes first, with no hour limit in the first 24 months. Both model pages show our current price, and you can request a quote for fleet pricing and John Deere Financial options.

Diesel Mower Service and Parts

Diesel mowers run long hours, so filters, belts and blades come due often. Our turf technicians service commercial ZTrak mowers, and a turf off-season inspection gets your machine ready before the season. Genuine parts are at your Koenig store and anytime on Koenig Marketplace.

Schedule service or ask about pickup for fleet work.

John Deere QuikTrak stand-on mower, Gator, and other equipment in a Koenig Equipment service bay

Compare Gas Models or Shop Used

Prefer gas or propane? See the Z900 gas ZTrak mowers, or compare all John Deere commercial mowers. Shopping pre-owned? Browse used John Deere zero-turn mowers for sale at Koenig.

Z900 Diesel Mower FAQs

Why choose a diesel zero-turn mower?
A diesel suits high-acreage, full-season mowing where run time and durability matter. For lighter weekly mowing, a gas Z900 may be the more economical choice, and our team can help you compare.

What is the difference between the Z994R and Z997R?
The Z997R has a 37.4 hp diesel and a 12 gal tank. The Z994R has a liquid-cooled 3-cylinder diesel, an 11.5 gal tank and adds a 60 in. Mulch On Demand deck option.

Can the Z997R run on biodiesel?
Yes. The Z997R is listed as biodiesel (B20) compatible.

What warranty comes with the Z997R?
36 months or 1,500 hours, whichever comes first, with no hour limitation for the first 24 months.