Ariens
Front-Engine Lawn Tractor

Model # A21A42-96046005400 Official Ariens lawn tractor

Here are the diagrams and repair parts for Official Ariens A21A42-96046005400 lawn tractor, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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Showing 10 of 565 parts  |

Lawn Tractor Mandrel Housing 532187281
#14

Mower deck diagram

Lawn tractor mandrel housing

Part #532187281

Replaced by #587819701

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Manufacturer substitution
This part replaces 532187281. Substitute parts can look different from the original.
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$46.13
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Lawn Tractor 42-in Deck High-lift Blade (replaces 138971) 532138971
#11

Mower deck diagram

Lawn tractor 42-in deck high-lift blade (replaces 138971)

Part #532138971

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$22.14
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Hub Cap 532175039
#8

Wheels & tires diagram

Hub cap

Part #532175039

Replaced by #532104757

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Manufacturer substitution
This part replaces 532175039. Substitute parts can look different from the original.
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$5.31
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Lawn Tractor Ground Drive Belt, 1/2 X 94-in 532130969
#56

Drive diagram

Lawn tractor ground drive belt, 1/2 x 94-in

Part #532130969

Replaced by #592855201

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Manufacturer substitution
This part replaces 532130969. Substitute parts can look different from the original.
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Locking Flange Nut 873900600
Locking flange nut

Part #873900600

Replaced by #532409149

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Manufacturer substitution
This part replaces 873900600. Substitute parts can look different from the original.
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Lawn Tractor Self-tapping Bolt 532173984
#30

Mower deck diagram

Lawn tractor self-tapping bolt

Part #532173984

Replaced by #584953901

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Manufacturer substitution
This part replaces 532173984. Substitute parts can look different from the original.
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Idler Pulley 532197379
#36

Mower deck diagram

Idler pulley

Part #532197379

Replaced by #196106

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Manufacturer substitution
This part replaces 532197379. Substitute parts can look different from the original.
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Lawn Tractor Starter Solenoid 532192507
#43

Electrical diagram

Lawn tractor starter solenoid

Part #532192507

Replaced by #582042802

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Manufacturer substitution
This part replaces 532192507. Substitute parts can look different from the original.
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Mandrel Pulley 532197473
#32

Mower deck diagram

Mandrel pulley

Part #532197473

Replaced by #195945

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Manufacturer substitution
This part replaces 532197473. Substitute parts can look different from the original.
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Lawn Tractor Ground Drive Idler Pulley 532194326
#52

Drive diagram

Lawn tractor ground drive idler pulley

Part #532194326

Replaced by #194326

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Manufacturer substitution
This part replaces 532194326. Substitute parts can look different from the original.
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Most common symptoms to help you fix your riding mowers & tractors

Choose a symptom to see related riding mower and lawn tractor repairs.

Main causes: punctured tire or inner tube, leaky valve stem, damaged wheel rim…

Main causes: clogged carburetor, damaged flywheel key, dirty spark plug, stale fuel, improper valve lash, engine needs a…

Main causes: worn or broken ground drive belt, bad seat switch, transaxle freewheel control engaged, transaxle failure, …

Main causes: damaged tie rods, bent or worn wheel spindle, worn front axle, damaged sector gear assembly…

Main causes: engine overfilled with oil, leaky head gasket or sump gasket, damaged carburetor seals, cracked fuel pump, …

Main causes: shift lever needs adjustment, neutral control needs adjustment…

Main causes: worn or broken blade belt, broken belt idler pulley, blade clutch cable failure, bad PTO switch, damaged ma…

Main causes: damaged cutting blade, worn deck pulley, damaged mandrel pulley, loose fasteners on mower deck components…

Main causes: faulty battery, bad alternator…

Most common repair guides to help fix your riding mowers & tractors

These step-by-step repair guides will help you safely fix what’s broken on your riding mower or lawn tractor.

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How to replace a riding lawn mower rear tire

Your mower can’t run on a damaged rear tire. Here’s how to install a new one.…

Repair difficulty
Time required
 60 minutes or less
How to replace a riding lawn mower blade

How to replace a riding lawn mower blade

If a blade on your mower is dull or bent, replace it following the steps in this repair guide.…

Repair difficulty
Time required
 30 minutes or less
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How to replace a riding lawn mower fuel filter

Help your mower run better by replacing the fuel filter during your riding mower's annual tune-up.…

Repair difficulty
Time required
 15 minutes or less

Effective articles & videos to help repair your riding mowers & tractors

Use the advice and tips in these articles and videos to get the most out of your riding mower or lawn tractor.

How to remove a lawn mower blade using a removal tool

How to remove a lawn mower blade using a removal tool

Learn how a blade removal tool makes replacing the blade easier and safer…

Riding lawn mower engine clicks but doesn't turn over video

Riding lawn mower engine clicks but doesn't turn over video

Check the starter solenoid, starter motor, wiring, battery and engine.…

Riding mower and tractor common questions

Riding mower and tractor common questions

You might find the answers to your questions about your riding mower or lawn tractor in this list of frequently asked qu…