Medium
30-60 minutes
The screw attaches to the hub sprocket. It is an original Craftsman part for use in snowblowers. This item is sold individually. During replacement, it may require a wrench to help install this part correctly. It is made out of metal and will need to be replaced if it strips or breaks.
Screw, 1/4-20x2.25 Hh 73839MA
OEM part for: Murray
Part Number: 73839MA
$5.99
In Stock
Ships within 1 business day 
Compatibility
This Screw, 1/4-20x2.25 Hh will fit the following 239 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:
- Snowblower Parts
This part replaces obsolete part #: 73839, MT73839MA, 725430
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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.
Drive chain and sprocket warn out
Richard - December 26, 2022
Tool Type
Snowblower
Difficulty
Easy
Time
1-2 hours
Tools Used
Screwdriver, Pliers, Power Drill, Socket set, Wrench Set, Adjustable Wrench, Hand Grinder
Remove inspection cover removed left tire from
Axle Remove sprocket bolt w/nut
Removed drive Chain by removing 1 link had clean shaft with grinder
Taped of gear cleaned shaft with grinder installed New gear and roller chain had to Remove master link
To install chain reinstalled master link taped drive Axle Into Place also tighten hold-down clip on Axle also
Taped spacer out through rim and tire assembly too Axle tight from shifting put tire on also Greased roller chain and sprocket replaced inspection cover back on started and tested drive assembly checked auger and found 1 sheer pin missing replaced Snow blower Ready
Axle Remove sprocket bolt w/nut
Removed drive Chain by removing 1 link had clean shaft with grinder
Taped of gear cleaned shaft with grinder installed New gear and roller chain had to Remove master link
To install chain reinstalled master link taped drive Axle Into Place also tighten hold-down clip on Axle also
Taped spacer out through rim and tire assembly too Axle tight from shifting put tire on also Greased roller chain and sprocket replaced inspection cover back on started and tested drive assembly checked auger and found 1 sheer pin missing replaced Snow blower Ready
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Bolt broke and entire wheel lock assembly fell off and was lost.
Mike - November 25, 2020
Tool Type
Snowblower
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Socket set, Adjustable Wrench
1. Wished that the entire assembly was sold as 1 piece.
2. Assembled the parts into the entire assembly.
3. Bolted it to the axle.
Works great!
2. Assembled the parts into the entire assembly.
3. Bolted it to the axle.
Works great!
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18 years of moving large amounts of snow in Ohio for 2 years and 16 years in Minnesota, it happens
David - June 5, 2020
Tool Type
Snowblower
Difficulty
Hard
Time
1-2 hours
Tools Used
Screwdriver, Pliers, Socket set, Wrench Set, Nutdriver, Adjustable Wrench
Parts Used
- Spring, Idler Tractio - 53704MA
- Bolt, 3/8-16x1.25 Carr. - 703227
- Bearing Trunnion Assembly - 1739282YP
- Stop,plastic.375 - 7289MA
- Nut, 3/8-16 Hxctrlkja - 41529MA
- Return Spring - 53818MA
- Lever Spring - 579937MA
- Trunion Bearing - 85501MA
- Roller Chain - 579867MA
- Masterlink 4 - 760504MA
- Screw - 761760MA
- Screw, 1/4-20x2.25 Hh - 73839MA
- Chute Worm Gear - 585196MA
- Wf Jackshaft #41-36t/ - 761789MA
- Pulley, Idler - 1502120MA
- Chain Roller - 583013MA
replace all the parts and turn the monster loose on large amounts of snow in Minnesota to watch it fly far, far away..... thanks for having what I need to keep my snow eating machine growling in the face of Minnesota Winters like
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Axle bushings wore down to where the axle had too much play and would kink the chain drive.
Walt - October 26, 2017
Tool Type
Snowblower
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver, Wrench Set, Rubber Mallet
1.Remove wheels and bottom plate
2. Utilize a screwdriver to pull worn out bushings out (retainer ring was wore completely away)
3. Put in new bushings on both sides
4. Pounded the retaining ring on both sides using a rubber mallet to push the ring all the way into the slot to hold bushing in place
5. Replaced bottom plate with new screws and lock washers
6. Wiped excess lubricant and the snow blower ran great
2. Utilize a screwdriver to pull worn out bushings out (retainer ring was wore completely away)
3. Put in new bushings on both sides
4. Pounded the retaining ring on both sides using a rubber mallet to push the ring all the way into the slot to hold bushing in place
5. Replaced bottom plate with new screws and lock washers
6. Wiped excess lubricant and the snow blower ran great
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Thanks for voting and helping fellow customers!
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Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
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.
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