Easy
30-60 minutes
This is a genuine part that is sourced directly from the original equipment manufacturer for use with Murray lawn mowers and garden tractors. It is the part that helps to apply tension on the transmission belt. Over time it may wear out or get damaged eventually requiring a replacement to ensure your equipment runs great. Keep in mind this high-quality component is made of durable materials and is sold as an individual item. Check the owners manual and the diagrams of your model for the exact location and the correct installation of this pulley. You will need a wrench set to remove the old pulley and secure the new one.
Idler Pulley-bside 91179MA
OEM part for: Murray
Part Number: 91179MA
$21.18
In Stock
Ships within 1 business day 
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Compatibility
This Idler Pulley-bside will fit the following 309 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Murray
Show More Compatible ModelsThis item works with the following types of products:
- Lawn Tractor Parts
This part replaces obsolete part #: 091179MA, 021409MA
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Have always received the correct part to start with very quickly. These folks always respond fast. Never had a bad experience. My go to guys for any repairs. The stove good, the riding mower, and others. Great customer service. Never had a bad experience. First rate.
Terry -
June 27, 2023
Verified Purchase
Idler pulley
Was not damaged fit perfectly, received sooner than was expecting.
Nicholas -
September 23, 2022
Verified Purchase
ordering this part was extreemly easy and the part fit perfectly. could not be hppier.
The part was exactly what I needed was an exact fit and very easy to install
Guest -
August 9, 2021
Verified Purchase
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Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
The bearing in the plastic backside idler pulley froze and the belt destroyed the pulley.
Dexter - July 23, 2016
👍 17 of 19 people found this instruction helpful
Tool Type
Lawn Tractor
Difficulty
Easy
Time
15-30 minutes
Tools Used
Socket set, Scissor Jack, Jack Stands, Wheel Chocks
Parts Used
Raise front of Murray tractor by using ramps or a jack and jack stands. Put wheel chocks on both sides of the tires to prevent any movement. Push brake/clutch pedal all the way down and engage parking brake. This will take belt tension off of the idler pulley so it can be easily removed and a new one installed. Lower the mower deck as far down as it will go to give more space for working on the pulley. Remove the nut holding on the old pulley with a 9/16" socket wrench and remove the pulley. Install new pulley and reinstall the nut. I did not have information on how much torque to apply to the nut so I tightened it to a point where I felt it was not over tightened. .Undo the parking brake and carefully bring the tractor back down to the ground and you're good to go.
Note: You should examine the drive belt for any damage the frozen idler pulley bearing may have caused to the belt and replace it if necessary. Replacing the drive belt is a major task and I was lucky my drive belt was o.k. for a few more years.
I really appreciated that eReplacement Parts had an OEM part for my 20 year old Murray tractor.
Note: You should examine the drive belt for any damage the frozen idler pulley bearing may have caused to the belt and replace it if necessary. Replacing the drive belt is a major task and I was lucky my drive belt was o.k. for a few more years.
I really appreciated that eReplacement Parts had an OEM part for my 20 year old Murray tractor.
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Pulley wore out. Bearings crumbled out as I removed it.
Jonathan - June 25, 2016
👍 8 of 9 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
1-2 hours
Tools Used
Screwdriver, Socket set, Wrench Set
Parts Used
Pulled the spring tensioned arm back and held it with a screw driver (long one).
Took the lock nut off.
Found spacers at local hardware store and had to put 5 or so washers below the pulley. This was necessary to make the pulley high enough to not pull the belt off.
Took several tries to get the pulley height correct. Once on high enough it was fine. Rather hard to press the belt under the guard that keeps it in place. I probably should have put that on before I screwed it in place but it was not clear initially so I forced it.
It was hard to work in the confined space - my arms barely fit in there. Had one wheel off in the rear and had it up on jack stands.
Took the lock nut off.
Found spacers at local hardware store and had to put 5 or so washers below the pulley. This was necessary to make the pulley high enough to not pull the belt off.
Took several tries to get the pulley height correct. Once on high enough it was fine. Rather hard to press the belt under the guard that keeps it in place. I probably should have put that on before I screwed it in place but it was not clear initially so I forced it.
It was hard to work in the confined space - my arms barely fit in there. Had one wheel off in the rear and had it up on jack stands.
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Pulley broke apart
Ernie - May 4, 2016
👍 7 of 8 people found this instruction helpful
Tool Type
Lawn Tractor
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Wrench Set
Parts Used
Used a wrench to remove nut holding pulley on shaft and then installed the new pulley
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Pulley bearing froze
Ronald - December 7, 2016
👍 2 of 2 people found this instruction helpful
Tool Type
Lawn Tractor
Difficulty
Easy
Time
15-30 minutes
Tools Used
Socket set, Pneumatic impact wrench
Raised the front end off the mower and put blocks below it, ad blocked the rear wheels
Remove the nut holding the pulley on, and remove the pulley
Installed the pulley on the shaft and tightened the nut
Remove both nuts from the blade axles and the washers
Install two new blades
Placed the washers on and tightened the blade nut
Remove the nut holding the pulley on, and remove the pulley
Installed the pulley on the shaft and tightened the nut
Remove both nuts from the blade axles and the washers
Install two new blades
Placed the washers on and tightened the blade nut
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Lawn mower clutch pulley was missing
Kyle - July 24, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Lawn Tractor
Difficulty
Easy
Time
15-30 minutes
Tools Used
Socket set
Parts Used
I installed the one you listed I needed on the parts diagram and it worked perfect.
I removed the nut holding the pulley on, the installed the new pulley with the nut.
I removed the nut holding the pulley on, the installed the new pulley with the nut.
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Belt and idler pulley were worn.
Allen - July 8, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Lawn Tractor
Difficulty
Easy
Time
15-30 minutes
Tools Used
Pliers, Wrench Set, Adjustable Wrench
Parts Used
1. Dropped the mower deck.
2. Replaced the drive belt and the pulley.
2. Replaced the drive belt and the pulley.
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Pulley broke
Thomas - June 30, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Lawn Tractor
Difficulty
Easy
Time
15-30 minutes
Tools Used
Socket set
Parts Used
Replaced pulley after loosening nut. Relaxed with new pulley. Easy peasey.
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Tractor would engage in gear
Jeff - June 30, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Lawn Tractor
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Socket set
Parts Used
Simply removed the retaining nut, replaced pulley, torqued nut
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Pulley broke
Robert - November 8, 2016
👍 2 of 3 people found this instruction helpful
Tool Type
Lawn Tractor
Difficulty
Easy
Time
15-30 minutes
Tools Used
Wrench Set
Parts Used
Removed the old damaged part and replaced it with the new idler pulley.
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Lawn mower drive belt worn out and drive pulley
Fred - October 25, 2016
👍 1 of 1 people found this instruction helpful
Tool Type
Lawn Tractor
Difficulty
Medium
Time
30-60 minutes
Tools Used
Pliers, Socket set
Removed the old components. Replaced the belt and the pulley.
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All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
