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Backside Idler Pulley

Part Number: 91179MA
Murray
Availability: 4 in stock
Price: $19.02
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*This part replaces obsolete part #: 091179MA and 021409MA.

Product Information
Manufacturer: Murray
Product Number: 91179MA
Classification: Part
Weight: 0.30 lbs.
Shipping: Ships Worldwide
Description:
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.
Frequently Purchased With
Compatibility

This part is compatible with the following machines:

Murray
31720x11B (2000) 30" Lawn Tractor
40320x88 (2000) 40" Lawn Tractor
40507x8B (2000) 40" Lawn Tractor
40530x51C (2000) 40" Lawn Tractor
46400A (1996) Garden Tractor
46400x5A (1996) Garden Tractor
46400x65A (1996) Garden Tractor
46401x6A (1996) 46 Inch Cut Lawn Tractor
46404x21A (1996) 46 Inch Cut Lawn Tractor
46403x199A (1996) 46 Inch Cut Lawn Tractor
46403x30A (1996) 46 Inch Cut Lawn Tractor
46404x8A (1996) 46 Inch Cut Lawn Tractor
46403x8A (1996) 46 Inch Cut Lawn Tractor
38602X66F (1996) 38 Inch Cut Lawn Tractor
38602X70H (1996) 38 Inch Cut Lawn Tractor
31621x70G (1996) 31 Inch Cut Lawn Tractor
38602X70J (1996) 38 Inch Cut Lawn Tractor
38623x5C (1996) 38 Inch Cut Lawn Tractor
38623x5D (1996) 38 Inch Cut Lawn Tractor
38632x66B (1996) 38 Inch Cut Lawn Tractor
38702x20D (1996) 38 Inch Cut Lawn Tractor
38702x20E (1996) 38 Inch Cut Lawn Tractor
38705x30A (1996) 38 Inch Cut Lawn Tractor
38705x5A (1996) 38 Inch Cut Lawn Tractor
38705x5B (1996) 38 Inch Cut Lawn Tractor
40706B (1996) 40 Inch Cut Lawn Tractor
40708x20C (1996) 40 Inch Cut Lawn Tractor
40708C (1996) 40 Inch Cut Lawn Tractor
40708x20D (1996) 40 Inch Cut Lawn Tractor
40708Cx192B (1996) 40 Inch Cut Lawn Tractor
40708x8A (1996) 40 Inch Cut Lawn Tractor
40708Cx92B (1996) 40 Inch Cut Lawn Tractor
40715x199B (1996) 40 Inch Cut Lawn Tractor
40708x8B (1996) 40 Inch Cut Lawn Tractor
40715x99A (1996) 40 Inch Cut Lawn Tractor
40715x99B (1996) 40 Inch Cut Lawn Tractor
40715x199A (1996) 40 Inch Cut Lawn Tractor
40815x70B (1996) 40 Inch Cut Lawn Tractor
40900x20C (1996) 40 Inch Cut Lawn Tractor
40901x70D (1996) 40 Inch Cut Lawn Tractor
40900x20D (1996) 40 Inch Cut Lawn Tractor
40907x20B (1996) 40 Inch Cut Lawn Tractor
40901x70C (1996) 40 Inch Cut Lawn Tractor
40907x20C (1996) 40 Inch Cut Lawn Tractor
42816B (1996) 42 Inch Cut Lawn Tractor
40908x70B (1996) 40 Inch Cut Lawn Tractor
42816C (1996) 42 Inch Cut Lawn Tractor
40908x70C (1996) 40 Inch Cut Lawn Tractor
40910B (1996) 40 Inch Cut Lawn Tractor
42819A (1996) 42 Inch Cut Lawn Tractor
42803x5A (1996) 42 Inch Cut Lawn Tractor
42819B (1996) 42 Inch Cut Lawn Tractor
42819x7B (1996) 42 Inch Cut Lawn Tractor
42819x30A (1996) 42 Inch Cut Lawn Tractor
42819x8B (1996) 42 Inch Cut Lawn Tractor
42819x62A (1996) 42 Inch Cut Lawn Tractor
42820x24A (1996) 42 Inch Cut Lawn Tractor
46401x30A (1998) 46" Cut Garden Tractor
42504x71A (1998) 42" Lawn Tractor
42504x99A (1998) 42" Lawn Tractor
40564x51A (1998) 40" Lawn Tractor
42505x92A (1998) 42" Lawn Tractor
42500A (1998) 42" Lawn Tractor
42506x92A (1998) 42" Lawn Tractor
42500x30A (1998) 42" Lawn Tractor
31722x95A (1999) 31" Lawn Tractor
42541B (1998) 42" Lawn Tractor
42500x82A (1998) 42" Lawn Tractor
38500x30A (1999) 38" Lawn Tractor
31720x11C (1999) 31" Lawn Tractor
42542C (1998) 42" Lawn Tractor
31720x51C (1999) 31" Lawn Tractor
42544x31A (1998) 42" Lawn Tractor
42534x30A (1998) 42" Lawn Tractor
38716x82A (1999) 38" Lawn Tractor
40504x92A (1999) 40" Lawn Tractor
38710A (1999) 38" Lawn Tractor
38713x71A (1999) 38" Lawn Tractor
40542D (1999) 40" Lawn Tractor
42537A (1998) 42" Lawn Tractor
40505x95A (1999) 40" Lawn Tractor
42539A (1998) 42" Lawn Tractor
38715A (1999) 38" Lawn Tractor
40502x50B (1999) 40" Lawn Tractor
38715x82A (1999) 38" Lawn Tractor
40503x88B (VRO40-12GXT) (1999) 40" Lawn Tractor
42544x8A (1998) 42" Lawn Tractor
40530x51B (1999) 40" Lawn Tractor
42544x8B (1998) 42" Lawn Tractor
40541C (1999) 40" Lawn Tractor
40566x95A (1999) 40" Lawn Tractor
42504x99B (1999) 42" Lawn Tractor
42545x29A (1998) 42" Lawn Tractor
42583A (1998) 42" Lawn Tractor
42560x30A (1998) 42" Lawn Tractor
42583x82A (1998) 42" Lawn Tractor
42567x30A (1998) 42" Lawn Tractor
52461x89A (1998) 52" Cut Garden Tractor
42578x30A (1998) 42" Lawn Tractor
42583x9A (1998) 42" Lawn Tractor
42588x52A (1998) 42" Lawn Tractor
42590A (1998) 42" Lawn Tractor
42589x8 (1999) 42" Lawn Tractor
42586x8A (1998) 42" Lawn Tractor
42590x92A (1998) 42" Lawn Tractor
42586x9A (1998) 42" Lawn Tractor
46576x92A (1999) 46" Lawn Tractor
42590x92B (1999) 42" Lawn Tractor
42588x29A (1998) 42" Lawn Tractor
42591x86A (1998) 42" Lawn Tractor
42591x92A (1998) 42" Lawn Tractor
42591x92A (1999) 42" Lawn Tractor
31720x51B (1998) 31" Lawn Tractor
38502x51B (1998) 38" Lawn Tractor
31721x88A (1998) 31" Lawn Tractor
31720x11B (1998) 31" Cut Lawn Tractor
38502x98A (1998) 38" Lawn Tractor
38500B (1998) 38" Lawn Tractor
46567x30A (1998) 46" Lawn Tractor
38515x83A (1998) 38" Lawn Tractor
46569x71A (1998) 46" Lawn Tractor
38501x50B (1998) 38" Lawn Tractor
46568x6A (1998) 46" Lawn Tractor
46569x92A (1998) 46" Lawn Tractor
46569x6A (1998) 46" Lawn Tractor
46569x9A (1998) 46" Lawn Tractor
42597x95A (1999) 42" Lawn Tractor
46570x6A (1998) 46" Lawn Tractor
46570x8A (1998) 46" Lawn Tractor
46573x92A (1998) 46" Lawn Tractor
46570x71A (1998) 46" Lawn Tractor
50568x9A (1998) 46" Lawn Tractor
38515x92A (1998) 38" Lawn Tractor
38515x92B (1998) 38" Lawn Tractor
38516x29A (1998) 38" Lawn Tractor
38711x52A (1998) 38" Lawn Tractor
38711x66A (1998) 38" Lawn Tractor
38711x67A (1998) 38" Lawn Tractor
38711x73A (1998) 38" Lawn Tractor
38714x51A (1998) 38" Lawn Tractor
38516x52A (1998) 38" Lawn Tractor
39711x97A (1998) 39" Lawn Tractor
38710A (1998) 38" Lawn Tractor
40502x50A (1998) 40" Lawn Tractor
38711x20A (1998) 38" Lawn Tractor
40503x88A (1998) 40" Lawn Tractor
38711x29A (1998) 38" Lawn Tractor
38711x96A (1998) 38" Lawn Tractor
40541x99B (1998) 40" Lawn Tractor
38712x53A (1998) 38" Lawn Tractor
Expand the 150+ compatible machines
Products Compatibility

This item works with the following types of products:

  • • Lawn Tractor
Questions & Answers

No questions have been asked yet
Repair Instructions: Submitted by Customers Like You
17 of 19 people found this instruction helpful
Tool Type:
Lawn Tractor
Parts Used:
Backside Idler Pulley - 91179MA
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Socket set, Scissor Jack, Jack Stands, Wheel Chocks
The bearing in the plastic backside idler pulley froze and the belt destroyed the pulley.
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.
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8 of 9 people found this instruction helpful
Tool Type:
Lawn Mower
Parts Used:
Backside Idler Pulley - 91179MA
Repair Difficulty:
Medium
Time Spent Repairing:
1-2 hours
Tools Used:
Screwdriver, Socket set, Wrench Set
Pulley wore out. Bearings crumbled out as I removed it.
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.
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7 of 8 people found this instruction helpful
Tool Type:
Lawn Tractor
Parts Used:
Backside Idler Pulley - 91179MA
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Wrench Set
Pulley broke apart
Used a wrench to remove nut holding pulley on shaft and then installed the new pulley
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2 of 2 people found this instruction helpful
Tool Type:
Lawn Tractor
Parts Used:
Mulching Blade - 95100E701MA
Backside Idler Pulley - 91179MA
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Socket set, Pneumatic impact wrench
Pulley bearing froze
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
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1 of 1 people found this instruction helpful
Tool Type:
Lawn Tractor
Parts Used:
Backside Idler Pulley - 91179MA
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Socket set
Lawn mower clutch pulley was missing
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.
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1 of 1 people found this instruction helpful
Tool Type:
Lawn Tractor
Parts Used:
Backside Idler Pulley - 91179MA
V-Belt - 37X80MA
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Pliers, Wrench Set, Adjustable Wrench
Belt and idler pulley were worn.
1. Dropped the mower deck.
2. Replaced the drive belt and the pulley.
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1 of 1 people found this instruction helpful
Tool Type:
Lawn Tractor
Parts Used:
Backside Idler Pulley - 91179MA
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Socket set
Pulley broke
Replaced pulley after loosening nut. Relaxed with new pulley. Easy peasey.
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Thanks for voting and helping fellow customers!
1 of 1 people found this instruction helpful
Tool Type:
Lawn Tractor
Parts Used:
Backside Idler Pulley - 91179MA
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Socket set
Tractor would engage in gear
Simply removed the retaining nut, replaced pulley, torqued nut
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2 of 3 people found this instruction helpful
Tool Type:
Lawn Tractor
Parts Used:
Backside Idler Pulley - 91179MA
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Wrench Set
Pulley broke
Removed the old damaged part and replaced it with the new idler pulley.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
1 of 1 people found this instruction helpful
Tool Type:
Lawn Tractor
Parts Used:
Motion Drive Belt - 37X87MA
Backside Idler Pulley - 91179MA
Repair Difficulty:
Medium
Time Spent Repairing:
30-60 minutes
Tools Used:
Pliers, Socket set
Lawn mower drive belt worn out and drive pulley
Removed the old components. Replaced the belt and the pulley.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Reviews
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  • 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
    Verified Purchase
    eReplacementParts Team
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    Product Information
    Manufacturer: Murray
    Product Number: 91179MA
    Classification: Part
    Weight: 0.30 lbs.
    Shipping: Ships Worldwide

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