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Companion
Front-Engine Lawn Tractor

Model # 917278040 Official Companion lawn tractor

Here are the diagrams and repair parts for Official Companion 917278040 lawn tractor, as well as links to manuals and error code tables, if available.

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  • In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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For DIY troubleshooting advice and repair guides, visit our repair help section.

Owner’s manual
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Model diagram and schematic

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Showing 10 of 505 parts  |
Lawn Tractor Axle Cap 104757X428
#11

Wheels and tires diagram

Lawn tractor axle cap

Part #104757X428

Replaced by #532104757

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Manufacturer substitution
This part replaces 104757X428. Substitute parts can look different from the original.
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Lock Nut 73900600
#120

Drive diagram

Lock nut

Part #73900600

Replaced by #532409149

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Manufacturer substitution
This part replaces 73900600. Substitute parts can look different from the original.
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Hex Flange Lock Nut 145212
Hex flange lock nut

Part #145212

Replaced by #532409149

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Manufacturer substitution
This part replaces 145212. Substitute parts can look different from the original.
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Lawn Tractor Ground Drive Belt, 1/2 X 82-in 140294
#57

Drive diagram

Lawn tractor ground drive belt, 1/2 x 82-in

Part #140294

Replaced by #532140294

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Manufacturer substitution
This part replaces 140294. Substitute parts can look different from the original.
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$32.99 | 
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Solenoid With Brass Plunger 178861
#43

Electrical diagram

Solenoid with brass plunger

Part #178861

Replaced by #532146154

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Manufacturer substitution
This part replaces 178861. Substitute parts can look different from the original.
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Tire 106222X
#3

Wheels and tires diagram

Tire

Part #106222X

Replaced by #532122073

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Manufacturer substitution
This part replaces 106222X. Substitute parts can look different from the original.
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Axle Assembly 175131
#2

Steering assembly diagram

Axle assembly

Part #175131

Replaced by #531171101

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Manufacturer substitution
This part replaces 175131. Substitute parts can look different from the original.
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Flanged Toplock Nut 178342
#33

Mower diagram

Flanged toplock nut

Part #178342

Replaced by #596134801

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Manufacturer substitution
This part replaces 178342. Substitute parts can look different from the original.
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Vented Mandrel Shaft Assembly 137645
#13

Mower diagram

Vented mandrel shaft assembly

Part #137645

Replaced by #532137646

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Manufacturer substitution
This part replaces 137645. Substitute parts can look different from the original.
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Lawn Tractor Blade Idler Pulley 127783
#47

Drive diagram

Lawn tractor blade idler pulley

Part #127783

Replaced by #532139245

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Manufacturer substitution
This part replaces 127783. Substitute parts can look different from the original.
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$30.45 | 
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Main causes: damaged cutting blade, worn deck pulley, damaged mandrel pulley, loose fasteners on mower deck components…

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Why is the steering loose on my riding mower?

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

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Why won't my riding mower cut grass?

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

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How do I fix a flat tire on my riding mower?

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

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Why is my riding mower leaking oil or gas?

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

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

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Why does my riding mower creep in neutral?

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

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Why won't my riding mower move?

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

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 60 minutes or less

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

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How to enjoy all the online benefits we offer on our Sears PartsDirect website

Learn about all the convenient features on our Sears PartsDirect website that make your parts purchases easier.…

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

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