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Petrol Machines

G660, G760 and G860

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Operators Manual
G660,760,860
  • Croquet
  • Tennis
  • Football
  • Rugby
  • Cricket
  • Golf
  • Lawns

Features include the quick change cassette system giving ultimate flexibility and a single power unit solution for many day to day maintenance tasks such as scarifying, verti-cutting and brushing.

This versatility coupled with low ground pressure and manoeuvrability makes the machine the first choice for a wide range of conventional and modern sand based turf construction systems.

  • Open construction means superior sight lines for accurate line up of mower
  • Cast 3 section aluminium ribbed roller for positive traction in all conditions and mark free turning
  • Rubber covered rear roller option
  • Low vibration handlebars
  • Large diameter front roller with adjustable scraper for precision height of cut control
  • Grooved Weile roller with comb available
  • Honda power – ultimate easy start long life engine with Q9 low noise, low vibration technology
  • 13 quick change cassette options
  • G660 G760 G860 - Adjustment of cylinder to bottom blade easy and postive with a single spanner
  • G660 G760 G860 - Precise height of control which easily adjusts on both sides with a single spanner
  • G660 G760 G860 - Easy and comfortable to operate controls incorporating parking brake and all the latest safety features

Specification

G660, G760 & G860

  • SpecificationG660G760G860
    Cutting Width

    660mm (26")

    760mm (30")

    860mm (34")

    Cylinder

    6 or 8 bladed heavy duty spiral

    Height of Cut

    8 - 56mm

    Cutter Performance

    95 cuts/m (88 cuts/yd)

    Dimensions L x W x H

    1250 x 875 x 1020mm

    1250 x 975 x 1020mm

    1250 x 1075 x 1020mm

    Weight (inc Cyl)

    148kg

    156kg

    166kg

    Engine Petrol

    Honda 5.5hp GX160

    Honda 5.5hp GX160

    Honda 6.5hp GX200

  • G660 G760 G860 - Hi comfort fully adjustable trailer seat

    High comfort fully adjustable trailer seat

    Suspension trailer seat
    D025/S
    Self steer suspension seat
    D025/SRG

    G660 G760 G860 - G-Series Transport Carrier

    Transport Carrier

    Prevents damage to rollers
    430 D083
    510 D081
    610 D082

    G660 G760 G860 - Weile Roller with Comb

    Weile Roller

    With comb in lieu of standard
    D002/WR
    D001/WR

    Cassette Stand-4

    Casette Stand

    Storage unit suitable for 4 cassettes.

    Rubber coated rear roller

    Rubber coated rear roller (for power unit) in lieu of standard.

  • 6 Bladed Cylinder

    6 Bladed Cylinder

    High quality British Steel blades in a single spiral format. Incorporating easy to set cutter adjustment

    8 Bladed Cylinder

    8 Bladed Cylinder

    High quality British Steel blades in a single spiral format. Incorporating easy to set cutter adjustment

    11 bladed cylinder

    11 bladed cylinder

    High quality British steel blades in a single spiral format. Incorporating easy to set cutter adjustment.

    1mm/ 2mm scarifier

    1mm Scarifier

    1mm thick replaceable, wear resistent blades. 12mm spacing for thatch removal throughout season and autumn/spring renovation work.

    1mm/ 2mm scarifier

    2mm Scarifier

    2mm thick replaceable, wear resistent blades. 12mm thatch removal throughout season and autumn/spring rennovation work.

    2mm tungsten tipped scarifier

    2mm scarifier tungsten tipped

    The ultimate scarifier with tungsten tipped blades for heavy duty thatch removal throughout season and autumn/spring renovation work.

    Brush - Soft Bristle

    Brush - Soft Bristle

    For moss and debris removal and use as a light scarifier for final pre-cut preparation.

    hard bristle brush

    Brush – hard bristle

    For moss and debris removal and use as a light scarifier for final pre cut preparation.

    multidense brush

    Brush - Multi Dense

    For moss and debris use as a light scarifier for final pre cut preparation.

    standard verticutter

    Verti-Cutter

    1mm thick, 10 fingered replaceable discs. Regular use controls thatch, lateral growth and the ingress of unwanted species such as annual meadow grass.

    tungsten tip verticutter.jpg

    Verti-Cutter Tungsten Tipped

    The ultimate verticutter with tungsten tipped blades for heavy duty usuage.

    ds32145 sorrel roller

    Sorrel Roller

    Replaceable spikes relieves surface tension and allows penetration of air, water and fertiliser to the root zone.

    spring tine rake

    Spring Tine Rake

    Ideal for lifting lateral growth, helping to stand grasses up, removing dead matter or broken leaves following a match. Also helps to break up algae crust or help remove the glutinous slime that can sometimes appear on fine turf.

  • SFMA 2024 Website.jpg

    Dennis heading to Daytona

    Dennis Mowers will be continuing its annual tradition of exhibiting at the Sports Field Management Association’s (SFMA) Conference & Exhibition, which is taking place at Ocean Center, Daytona Beach, between 22 - 25 January 2024.

    View Article
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    Reliable Dennis G860’s are Excellent for Hartpury

    Matthew Newman, Grounds and Sports Turf Manager at Hartpury University and Hartpury College in Gloucester, claims that his fleet of Dennis G860 mowers are reliable, robust, and ergonomically excellent.

    View Article
    Dennis G860 - King of the Kassam.jpeg

    Dennis G860 - King of the Kassam

    The Dennis G860 has ‘everything you need’ in a cylinder mower according to Kieron Jennings - Head Groundsman at Oxford United FC.

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    Article - There's-no-better-finish-than-a-Dennis-finish-for-Dartford-FC-head-groundsman-Jay-Berkhauer

    There’s no better finish than a Dennis

    Jay Berkhauer, Head Groundsman for Dartford FC, says that the Dennis G860 cylinder mower is hugely versatile and offers an unrivalled finish.

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    Article - Ravens-rave-about-the-Dennis-G860

    Ravens rave about the Dennis G860

    Sean Kauffman, Head Groundskeeper for National Football League (NFL) side Baltimore Ravens has revealed how two Dennis G860 cylinder mowers have significantly helped the grounds crew to improve the standards of the pitch at the M&T Bank Stadium.

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G-Series

Testimonials

  • "We have two G860s, and they provide the perfect cut. Their popularity in the U.S. is growing because they’re easy to maneuver, comfortable to operate, and simple to switch cassettes. We rely on the spring tine and 8-bladed cutting cassettes to prepare the pitch for matchday, sweeping debris and mowing to perfection. The quality of cut and presentation is excellent, and our pitch has never looked better."

    Sean Kauffman

    Head Groundskeeper for National Football League (NFL) - Baltimore Ravens

  • ''We use the G860 for cutting the outfield and sometimes we use it on the square and nets as well. We’ve got a verticut cartridge for it too, which is ideal for getting thatch out of the outfield and standing up the lateral growth on the square. We use a trailing seat on it for cutting the outfield – it helps us get the job done more quickly and also saves our legs. It’s our first-choice mower now because of its reliability, robustness and quality of cut.”

    Callum Lewin

    Head Groundsman Leicestershire County Cricket Club

  • "The G860 with the brush cassette has been a game-changer for us. It’s incredibly comfortable to use and makes pitch maintenance more efficient than ever. As Head of Maintenance at Moca FC Stadium in the Dominican Republic, I rely on it to keep our playing surface in top condition and it delivers every time."

    Yeremi Guerrero

    Head of Maintenance at Moca FC Stadium

  • "The G860 is a versatile, reliable machine—one mower can handle five or six jobs just by changing cassettes. It delivers excellent cut quality, great patterns, and is comfortable, well-balanced, and lightweight, ensuring top-notch pitch presentation without compaction. Simply an excellent piece of equipment."

    Ewan Hunter

    Nottingham Forest Head Groundsman

  • "After nearly 20 years of use, the G860 remains unbeatable. It’s versatile, easy to adjust, and handles multiple jobs—verticutting, scarifying, and more. Lightweight, manoeuvrable, and perfect for presentation, it’s the ideal mower for maintaining the club’s image."

    Richard Allsworth

    Head of Grounds, Yeovil Town FC

  • “Once we trialled the Dennis G860’s, we had to have them. They’re robust, easy to use, and ergonomically excellent with simple, well-placed controls. The G860 delivers a brilliant finish with a more defined stripe and lets us cover ground faster – we can now double cut in the time it used to take for a single pass. After years of use, they’ve proven incredibly reliable.”

    Matthew Newman

    Grounds and Sports Turf Manager at Hartpury University and Hartpury College in Gloucester,

  • "The G860 is reliable and, in my opinion, the best mower. With easy-to-change cassettes and rollers, it delivers a perfect finish and those iconic 'Dennis stripes -a big reason we chose it."

    Dylan Thompson

    Grounds Maintenance Manager, Colliers Park

  • "We purchased three G860's with the full range of cassettes which gives us so much versatility. We use them on a daily basis. The verticutting unit is used quite regularly to clean out the surface and we really see the benefits from this. The brushes are a great option too and we use the machines at both the stadium and the training ground.With three mowers we now double cut on match days and the G860's are perfect for presentation and getting a quality finish every time. They create the ideal pitch suitable for how the owners want the team to play. Dennis mowers are simply renowned for being a quality piece of kit and the equipment speaks for itself. They are really user friendly and since we've had them all of the team have been really impressed."

    Anthony Parker

    Deputy Head Groundsman. Wolverhampton Wanderers FC

  • ''We purchased the G860s due to the durability and reliability. Before acquiring these machines, the club struggled to achieve consistent mowing and verti-cutting quality, as previous equipment lacked precision and dependability. We have interchangeable cassettes to perform targeted maintenance operations. This workflow minimises downtime and eliminates the need for multiple specialised machines, increasing efficiency and pitch consistency''

    Mohammed Muhanna

    Agricultural Engineer, Al Ettifaq FC , Saudi

  • "I told the CEO that if we got a new G860 then it would be a good investment because it will more than likely outlast me! The finish is second to none and the sward has really thickened since using it. It is nice and light so you can use it anytime of the year without worrying about putting weight on the pitch. In my opinion, it is the ultimate mower for matchday preparation''

    Dale Stephen

    Head Groundsman , Inverness Caledonian Thistle FC

  • ''The Dennis G860 stands out with its 8-blade cylinder, delivering sharp and precise cuts. The cassette versatility allows the grounds team to complete all essential turf operations efficiently, saving both time and effort without compromising quality. I highly recommend the Dennis and SISIS machines to all stadium engineers''

    Malaz Mohammed Ali

    Pitch & Landscape Manager ,King Abdullah Sports City, Saudi

  • ''“The Dennis G860 is a great bit of kit. We use it for cutting the cricket squares, for cutting the grass hockey pitches, both rugby and football pitches and when we have county fixtures or cup games we will box off the cricket outfields because this gives it a much faster, truer surface so the ball will carry quicker. In my opinion the G860 is one of the best machines you can get and with the interchangeable cassette system, it is extremely versatile.”

    Glenn Davies

    Grounds Manager, Bloxham School, Oxfordshire

  • ''The first team like to play real football; fast one-touch football so we needed a tight, precise cut which the G860 delivers every time. We've got a trainee that has never used a cylinder mower, but with supervision he jumped straight on the G860's with no problem at all. The manager has never once complained about the pitch - in fact he is always complimenting it."

    Kieron Jennings

    Head Groundsman, Oxford City FC

  • "The G860’s interchangeable cassette system is incredible-one machine handles scarifying, brushing, and cutting with ease. With various cassettes, clearing debris is quick, and our pitch has never looked better. In just six months, the improvements have been amazing, and the grass is healthier than ever."

    Stuart Vause

    Head Groundsman, Castleford Tigers RLFC

  • "Easy to use and maintain, it creates incredible stripes that really enhance presentation. Every stadium I visited in the UK had Dennis stripes, and using this mower helped me develop a real feel for my pitch—results are outstanding. I’ve already recommended the G860 to several people, and I’m confident they’ll be just as impressed. Overall, it’s a first-class product supported by excellent people in the field."

    Shaun Ilten

    Director of Turf & Grounds at the StubHub Center, LA Galaxy

  • "I've got a wide range of turf maintenance machinery, but I believe in using only the very best. As soon as we got it out on the pitch, we saw that it was a fantastic machine. The cassette system is so simple to use and you can change them in less than two minutes,"

    John Stewart

    Head Groundsman at Deportivo Alaves FC in Spain

  • ''The G860 is like a four-in-one maintenance machine. In the summer, we were verticutting as much as we could because we knew we had a thatch issue and since then we have constantly brushed the pitch and raked the algae off the top of the surface. It has been a brilliant bit of kit for us and if we didn't have the G860 then these problems would only have intensified. The finish it provides is nothing short of excellent'. It's very easy to use and it takes no time at all to take the cassettes in and out. We have tried other machines and we just feel that the Dennis G860 is the best on the market."

    Matthew Hallam

    Grounds Manager, Notts County FC

  • ''At the stadium we use the G860s all the time for mowing, for presentation and for the final cut on match days - which we cut at 23mm. They are just perfect for achieving that perfect finish building up towards a match. We chose to buy the G860s because we consider them to be the best mowers on the market."

    Bruce Elliot

    Head of Grounds & Estates, Crystal Palace FC

  • "I'm extremely comfortable with the G860's - they are reliable, adaptable and they get the job done to the high standard I expect. Do you know what I like about the G860? It's the fact that it hasn't changed a lot. Dennis as a company has evolved with some other great machinery but the G860 doesn't need to. Why would you evolve something that doesn't need fixing? You can't improve perfection."

    James Williams

    Head Groundsman , London Stadium

  • "To be honest I don't think I'd even look at a machine other than a Dennis. I get tremendous back-up from them and they are forward thinking. Personally I think they are the world's best company in supplying mowers for groundsmen."

    Andy Jackson

    Head Groundsman, Grounds Manager, Andy Jackson

FAQS

What types of sports and turf surfaces are these mowers suitable for?

Croquet, Tennis, Football, Rugby, Cricket, Golf, High-quality lawns

What are the main differences between the G660, G760 and G860?

G660: 660mm (26") cutting width – ideal for smaller turf areas or where high manoeuvrability is needed.

G760: 760mm (30") cutting width – a balance of coverage and agility for medium-sized turf surfaces.

G860: 860mm (34") cutting width – perfect for large turf areas where maximum productivity is key e.g. football and rugby.

Do the G660, G760 and G860 allow interchangeable cassettes?

Yes there are 13 cassette options for tasks like scarifying, verti-cutting, brushing and more, all from a single power unit.

What engines do the G660,G760 and G860 use?

G660 & G760: Honda 5.5hp petrol engine (GX160), G860: Honda 6.5hp petrol engine (GX200)

What is the cutting height range?

All models offer a height of cut from 8mm to 56mm, adjustable on both sides with a single spanner.

What is the weight of each model?

G660: 148kg (including cylinder) , G760: 156kg, G860: 166kg

What rear roller is fitted?

Cast 3 section aluminium ribbed roller for positive traction in all conditions and mark free turning- OPTIONAL rubber covered rear roller

What Optional extras are available?

Rubber coated rear roller, suspension trailer seat, self steer suspension seat, Weile roller with comb, transport carrier