Part Location Diagram of 720-0170 MTD Knob-three Arm
See part B3 in the diagram
( Grid squares measure 1x1 inch )

Knob-three Arm 720-0170

Manufactured by:
MTD
ERP Number:
ERP9099092
Part Number:
720-0170
Original Equipment Manufacturer ?
  Works with your model  242A640-304!
In Stock
Delivers in 3-5 Business Days!

Easy 

30 - 60 mins 

(3 rated repairs) ?
  Works with your model   242A640-304!

Product Description

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It is a genuine manufacturer-sourced item which is specially designed for use with MTD blowers and chippers. This replacement thumb screw has a few different applications depending on the model of your unit, please refer to appropriate diagrams for correct location and use of this hardware. It is a high-quality item which is made of durable metal with plastic and it is sold individually.

Frequently Purchased Together

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Troubleshooting

This part works with the following brands:
  • MTD
  • Craftsman
  • Cub Cadet
  • Troy-Bilt
  • Yard Machines
  • Husky
  • Murray
This part works with the following products:
  • Chipper Shredder
  • Leaf Blower / Vacuum
  • Lawn Tractor
  • Lawn Tractor Accessories
  • Engine
  • Snow Blower
  • Lawn Mower
Part# 720-0170 replaces these:
  • 1643-057
  • 42391
  • 681-0048
  • 720-0170
  • 720-0170-CM
  • 720-0170P
  • 722-0108
  • 722-0120
  • 920-0170

Customer Part Reviews

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5.0
Average Rating (out of 5):
★★★★★
★★★★★
(2 Reviews)
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Questions & Answers

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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.

Easy 

30 - 60 mins 

(3 rated repairs) ?
  • 1
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Sorry, we couldn't find any existing installation instruction that matched.

the chipp[er wasn\'t used for over two years - lots of rust.

GLENN from WARREN, New Jersey

0 of 1 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
1- 2 hours
Parts Used:
720-0170
1. Checked gas and oil. Added some fresh gas - oil was OK.
2. Choked and pulled the starter cord. Engine turned over but cord didn\'t retract.
3. pulled engine cover off and sprayed WD-40 on end of snout. Balls freed up. Replaced the cover and pulled cord twice and the engine started. I let it run for 10 minutes.
4. The discharge chute hand knobs were totally rusted solid. I used a zip disk to remove then drilled out the remaining threaded part and ran a tap to establish new the threads.
5 Ordered a pair of hand knobs. Made a pair of temporary pieces from 5/16 bolts with a 2 inch piece of 1/4 inch round rod welded on the head.
6. I changed the direction of the discharge chute so it was more parallel with the ground. I modified the top of the chute by cutting each side at 2 inch intervals so I could flatten the top.
I made new sides from a piece of old washing machine sheet metal, drilled 3/8 inch holes along the top edge to plug weld them to the top piece. I cut the grooves to line up with the adjustment knobs. Sanded piece with a flap wheel then two coats of Rust-oleum.



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flail blade broke. Replace other worn parts while equipment was torn down.

Pete from Saucier, Mississippi

0 of 1 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
30 - 60 mins
Tools:
Socket set, Wrench set
1.Remove lower housing bolts.
2.Remove 2 front frame bolts and loosen 2 rear frame bolts.
3. Separate front shredder assy. housing from rear housing
4. Replace broken and worn parts on shredder hub
5. Reassemble unit.
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N/a

Gregory from Palmyra, Pennsylvania

0 of 1 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Parts Used:
720-0170
Turned hand knob into welded nut.
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  • 1

Model Cross Reference

This part works with the following models:
ERP Number: ERP9099092
Manufacturer Part Number: 720-0170
Brand Model Number Description
MTD 06-223572 Chipper Shredder - MTD Wood Chipper Model 06-223572/1990 (06223572/1990, 06 223572/1990) Parts
MTD 06-445183 Chipper Shredder - MTD Wood Chipper Model 06-445183/1992 (06445183/1992, 06 445183/1992) Parts
MTD 06-448641 Chipper Shredder - MTD Wood Chipper Model 06-448641 (06448641, 06 448641) Parts
MTD 06-479901 Chipper Shredder - MTD Wood Chipper Model 06-479901/1992 (06479901/1992, 06 479901/1992) Parts
MTD 06-480065 Chipper Shredder - MTD Wood Chipper Model 06-480065 (06480065, 06 480065) Parts
MTD 099 Chipper Shredder - Chipper
Troy-Bilt 1156421 Chipper Shredder - 1156421 - Chipper And Shredder Vacs
Troy-Bilt 1156448 Chipper Shredder - 1156448 - Chipper And Shredder Vacs
Troy-Bilt 1157957 Lawn Tractor - 1157957 - 17-Z Series
Troy-Bilt 1158625 Chipper Shredder - 1158625 - Chipper And Shredder Vacs
MTD 11630 Chipper Shredder - MTD Wood Chipper Model 11630 Parts
MTD 1270149 Chipper Shredder - MTD Wood Chipper Model 1270149 Parts
MTD 1270412 Chipper Shredder - MTD Wood Chipper Model 1270412 Parts
MTD 12A495D099 Chipper Shredder - MTD Wood Chipper Model 12A495D099 Parts
MTD 130-689G002 Chipper Shredder - Chipper
MTD 130-689G009 Chipper Shredder - Chipper
MTD 130-689G016 Chipper Shredder - Chipper
MTD 130-689G019 Chipper Shredder - Chipper
MTD 130-689G022 Chipper Shredder - Chipper
MTD 130-689G026 Chipper Shredder - Chipper
MTD 130-689G029 Chipper Shredder - Chipper
MTD 130-689G033 Chipper Shredder - Chipper
MTD 130-689G047 Chipper Shredder - Chipper
MTD 130-689G054 Chipper Shredder - Chipper
MTD 130-689G057 Chipper Shredder - Chipper
MTD 130-689G077 Chipper Shredder - Chipper
MTD 130-689G098 Chipper Shredder - Chipper
MTD 130-689G105 Chipper Shredder - Chipper
MTD 130-689G118 Chipper Shredder - Chipper
MTD 130-689G121 Chipper Shredder - Chipper