21 Hp 42″ Deck, Ys 4500 Lawn Tractor

When put in drive or reverse machine wont move

How to Identify and Fix Common Gardening Problems ?

We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :

The reasons why mower is not moving forward or reverse is that the battery is dead, or due to clogged fuel line. Additionally, malfunctioning transmission, or a broken drive belt, also a faulty spark plug, even when friction wheel isn`t in contact with the friction plate, or damaged Tires.
If your lawn mower turns on but won`t move, there could be a number of potential causes. The most common issues include a broken or damaged belt, a clogged discharge chute, a broken or damaged drive cable, or a damaged or clogged transmission.
If your riding lawn mower won`t drive forward or slows down when you go uphill, check the drive belt. Reinstall the lawn tractor or riding mower drive belt if it`s slipped out of place. Replace it if it`s damaged or broken.
Failure of any mechanical component, a broken hose, or clogged filter will cause tractor hydrostatic transmission problems. But the most common issue will be the oil itself. In the transmission section of your operator`s manual, you`ll find a section that covers oil viscosity.
Carburetor Problems Cause Mower Engines Not To StartThe carburetor regulates how air and fuel move through the engine to power your equipment. If it is dirty, that can cause poor engine performance or starting problems. Disconnected, dirty or fouled spark plugs are common causes for engines that won`t start.
Safety concerns with mowing backwards

The dominant safety concern that results when you mow backwards is that visibility is greatly compromised. When mowing backwards, you have to alter your line of vision, and it is easy to step into a pothole, or worse, collide into a young child.

Check the drive belt that is located just above the mower deck. Follow the belt as it wraps around the deck and to pulleys under the engine and the rear tires. Make sure the belt is secured to the pulleys, because if it is not, then the belt (and thus the mower) will not move. If the belt looks broken, replace it.
If the engine will idle but dies at full throttle the main jet in the carburetor may be plugged. You can repair a plugged main jet by cleaning it, replacing the jet, or replacing the carburetor. If you choose to clean or replace the main jet, you will also want to clean the rest of the carburetor.
Troubleshooting Hydrostatic Drives

If the system is overheating, check the oil level in the tank, inspect the heat exchanger, check the inline pressure filters, inspect the crossport relief valves, and check the pump and motor case drains for excessive bypassing.

If the blades are engaged and you shift to reverse the mower is designed to either shut off the blades or the engine. Some units have ROS, this is an additional position on the key switch that can be activated if the operator feels the need to mow in reverse.
Mow Forward

Most importantly, walking backward could be a safety risk. If you trip and fall back for whatever reason, you may pull the mower onto yourself and get hurt. That`s why you should always mow in a forward direction unless you really need to maneuver away from something.

An air lock in the transmission can cause problems with a lawn mower`s ability to go up hills. This problem occurs when air gets trapped in the transmission, which can cause it to lose power or stop working entirely. To solve this issue, it`s necessary to check for and remove any air locks in the transmission.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Wont stay running – Mtd 22" Yard Machine Push Mower
ANSWER : Under neath the carby is a single brass bolt, undo it

that one bolt is a multi jet, find four holes use a fine pin and carby cleaner ,hint one is at the top were the thread starts , one is in the inside center and two in the sides
put it back in and prim and start, hope it helps

I have had a poulan pro 550 series push mower for almost 1 year at the end of the season last year the mower would start briefly and then stop. i have cleaned out the air filter and that did not help.the mower started, i made one revolution around the yard 3/4th of the way the mower quit. I then primed the mower it started then quit and now it will not start at all. Does anyone have any suggestions of what to do. Thanks
ANSWER : There is a little spring that works the carburetor arm. If that popped off then the mower will not run.

Why is my spark plug black after five minutes of use
ANSWER : Too much gas
not enough air
check air cleaner

I have trouble starting a toro walk behind mower
ANSWER : All, I thought my carb was shot, so I replaced it. Still, start but no run (and had to use starting fluid). THEN!!! I noticed the spring to the “rev limiter” (just below and towards rear of carb) was not “tight”. The stupid bracket that holds the end of that spring had been bent down ~1/16″ and that caused all this heartache. CHECK YOUR REV LIMITER!!!

How do I take the top off of the mower to replace the pull cord? it looks like it is riveted in place. What kind of a tool do I use for that?
ANSWER : Here is my Tip on this subject that should help:www.fixya.com/support/r10031613-replace_pull_rope_lawn_push_mowerGood Luck!Jim

Carb problems wont stay running unless i unplug and plug in the anti diesel switch the plug on the fuel bowl
ANSWER : Check and see if all your carb jets or clean sound like some dirt got into one

My engine runs about 5 mins. and then just cuts off????
ANSWER : Dirty vent hole on carb rebuild it

Where is the carb on a 21 inch yard machine – Mtd Yard – Man 160cc, 21" Self – Propelled Lawn Mower
ANSWER : Behind the air box/ air filter