John Deere Z645
The John Deere Z645 zero turn mower is powered by a 27 hp twin cylinder engine. This 0.724 liter engine is lubricated using a full pressure lubrication system that has a capacity to hold up to 1.7 liters of oil. The air cooled engine is fed with gasoline from a fuel tank that can hold up to 13.2 liters (3.5 US gallons) of gas. Power from the engine gets to the wheels thanks to a dual hydrostatic transmission which makes operating and controlling the JD Z645 very easy once you get used to the twin lap bars in front of you.
The transmission gives the John Deere Z645 zero turn mower a top speed of 14.5 kph (9 mph) which makes it perfect for cutting grass on large open playing fields where you can really utilize this high top speed. As the JD Z 645 is a zero turn mower, the front wheels have little function other than keeping the machine balanced. All the turning is controlled by the rear tires. As a result, the front tires are small and offer little friction. They measure 13×6.5-6 (13 inch diameter, 6.5 inch width, 6 inch rim diameter), while the rear wheels have a much ‘grippier’ thread and are a lot bigger. They measure 23×10.5-12 (23 inch diameter, 10.5 inch width, 12 inch rim diameter).
Sitting and operating the John Deere Z645 lawn mower during long operating hours is not particularly uncomfortable. This is thanks in part to the fact that the driver’s seat has a high back and spring suspension. It is also adjustable so that you can choose a setting that is most comfortable for your height. The mower deck itself on the JD Z 645 has a cutting width of 48 inches and can be adjusted from as high as 4 inches above the ground to as low as 1 inch above the ground. Similar models include the John Deere Z510A and the John Deere Z520A lawn mowers.
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Fantastic
This is agreat mower. Very fast a comfortable . Done lots of research before buying. I looked at about all zero turn manufactors before I made a purchase . I was a little unsure about the Briggs motor on a 6000 dollar machine. But I took a chance and went with johndeere because I love their products . So far I love my z645 by far the best residential mower around. Time will tell about the Briggs but mower comes with a great warranty so I feel ok with it. If you are looking for a great residential zero turn you can’t go wrong with the z645.
This 2011 Z645 mower burned my grass whenever it took more than a couple of seconds to turn around. I spoke to my John Deere dealer and discovered that the 2012 Z645 has a thicker and wider muffler guard. The muffler and guard also are 1/2 inch higher than the 2011 version. My dealer told me that they would install the new muffler and guard assemblies under warranty, which they did. No more burn marks at all.
The choke does have an adjustment. There is a small circular disk near the cable attachment point on the engine. This disk has a triangular mark on it and this must point straight down when the throttle is at start/choke position. This can be done by moving the knob to the start/choke position, then loosen the cable clamp and slide the cable and cable housing until the triangle mark is straight down. Tighten the cable clamp and the engine will start in one second of cranking. Your dealer can also do this for you in warranty.
I was initially concerned that the fuel tank only held 3.5 gallons, because my old zero-turn held 5 gallons. However, I quickly learned that I am burning less gas with this new, bigger, heavier, and more powerful mower. It doesn’t need to hold five gallons.
I have a couple of low spots that get muddy after heavy rainfall. My old mower would get stuck. My Z645 John Deere has never even dug down into mud because the rear tires are so large.
I have a 5 ft belly deck for my 3520 but it is slower than my 645z with the high cap deck. The 3520 deck is so heavy to put on and take off I got sick of this wrenching on my back each time. I do love the zero turn and think this is the only way to go if you have trees and alot of close quarters. Don’t get me wrong it flies in the open spaces too. But if you’re lawn is large and rough you might want to think about how the zero turns feel after about 3 hours of bouncing around. Try one out first.
The Z645 is just plain hard to start. I bought mine in June 2011 and now Nov 2011 my battery is dead. I took it to a JD dealer and they told me that my battery was dead and they recharged it. i came home installed the battery and crank about 6 times and the battery die again. 6 months with a new battery and now it’s dead. I went to Lowe’s and bought me the 50.00 battery for up to 38hp mower. I installed the new battery and crank it two times before it started. i also bought some fuel cleaner from the dealer due to the 10percent ethanol. Dealer told me that I need to keep adding it to the gas. What will happen when gas increases the ethanol to 20 or 40 percent? I hope JD comes out with a modification. I hate to spend 7K and not be able to use my mower.
comfortable.
hard to start
muffler too close to the ground.
hand brake to far down.
had it for a month and do like the construction and ease of use along with the comfort built into it.
The first time I mowed I used the wash port after mowing which worked great but beware setting in one place and running will burn your grass. Yes, I said that right BURN your grass! I found that if I let the mower site in one spot no more than 15 seconds it will scorch the grass bad enough that it dies. I first though it was me but tried it in and area out of the way and it didn’t make any difference whether it was in idle or full throttle. JD said they were aware of the problem and were working on a fix. My question was why wasn’t I told this before purchase. My suggestion is to keep it moving or burn the grass. I hate to think about what might happen this fall with dry leaves when mowing.
Upon delivery of the mower, the engine would not start. The dealer had the choke linkage adjusted and the engine has run flawlessly since. I did alot of research on zero turn mowers before I bought the John Deere .For the price, quality and dealer support I am completly satisfied so far.
very happy, pls I have a full 4 year warranty on the entire mower including the engine
fast
smooth hydraulics, steers and handles well
clean smooth cut, cutting st augustine grass with it
seems like even when the engine is warmed up, it doesn’t start very easy
My brother just got one and we couldn’t even get the engine to start. It seems that the choke is not properl y adjusted somehow but there’s not much adjustments and nothing is specified for this in the manual.