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My lawnflite 703 blade drive belt keeps jumping its pulley. It looks like 2 pulleys don't line up properly. There appears to be 2 pulleys, one of which has a tension spring on it and the belt goes rould the pulley that drives teh blade and then onto teh tension pulley. It is these 2 pulleys that seem to not line up causing the belt to ride off and jam.

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  • alanincroft May 03, 2010

    The 2 pulleys that I refer to are both on the deck. One is attached to 1 of the blades and the tension pulley is right beside it. logically they should be level with each other but the tension pulley looks too high. The engine pulley is right at the front and the link between this and the tension pulley appears to be fine.

  • alanincroft May 03, 2010

    both pulleys are on the deck, not as suggested in the answer I received. 1 pulley is attached directly to one of the blades and the other appears to be a tensioner. They are about 10 mm out of alighnment. The link form the tension pulley to teh engine seems fine

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Hello

Is the belt new or used? Replace it if its old.How are the blades?if one is out of balance it will cause the deck to shake and the belt to jump off.

The deck also needs to be level,this is done with rods and jam nuts located under the mower above the deck.There should also be a pin near the engine pulley that keeps the belt in the groove of the pulley,make sure its there and not bent.

Posted on May 03, 2010

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  • Master
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The pulleys will not line up since one is connected to the engine and the other is connected to the "deck" which goes up and down.

Around the pulley connected to the deck there should be a piece of metal that helps keep the belt from slipping off, if it is bent too far from the pulley, bend it back in. Also I would replace the spring with a fresh new one to keep a good tension on the belt.

Posted on May 03, 2010

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REMOVAL & INSTALLATION

2.0L and 2.3L Gasoline Engines
See Figures 1, 2 and 3

zjlimited_754.jpg

Fig. 1: Exploded view of the timing belt cover on the 2.0L and 2.3L engine

zjlimited_755.jpg

Fig. 2: Exploded view of the timing belt assembly on the 2.0L and 2.3L engine

zjlimited_756.jpg

Fig. 3: Releasing the timing belt tensioner using a special tool

  1. Rotate the engine so that No. 1 cylinder is at TDC on the compression stroke. Check that the timing marks are aligned on the camshaft and crankshaft pulleys. An access plug is provided in the cam belt cover so that the camshaft timing can be checked without removal of the cover or any other parts. Set the crankshaft to TDC by aligning the timing mark on the crank pulley with the TDC mark on the belt cover. Look through the access hole in the belt cover to make sure that the timing mark on the cam drive sprocket is lined up with the pointer on the inner belt cover.
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CAUTION When draining the coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.
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  2. Loosen and position the power steering pump mounting bracket and position it aside.
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Hello,
My name is Dane and I am going to assist you in solving your problem.

On these drive belt pulleys, many times the pulleys will line up, but there can still be 2 common problems. First, Is there a chance tha the idler pulley bracket is bent? If it is bent it can still be in line with the other 2, but allow the bely to jump off because the pulley will still not be right.
The other problem can be that there is not enough tension on the belt. You may have to get a new idlerpulley spring and install it.
I hope this helps you. Thanks. Dane

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There is a service bulltin on this I have not seen this yet, Ill paste it for you to look at .
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UNITS AFFECTED: Model Number(s): Serial Number(s):
38620 240000001-240999999
38621 (Int'l.) 240000001-240999999
38632 240000001-240999999
38635 (Int'l.) 240000001-240999999
38642 240000001-240999999
38645 (Int'l.) 240000001-240999999
38652 240000001-240999999
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CORRECTION:
1. Remove the belt cover, engine belt guide and the bolt securing the crankshaft pulley.
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A. Chamfer edge after grinding/machining.
B. Remove 1/8”.
C. Masking tape used as a reference line.
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PARTS: P/N 94-8812 Traction Belt

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