Hydro-Gear
Engine & Drivetrain

Model # 321-0510 Official Hydro-Gear hydro-gear transaxle

Here are the diagrams and repair parts for Official Hydro-Gear 321-0510 hydro-gear transaxle, as well as links to manuals and error code tables, if available.

There are a couple of ways to find the part or diagram you need:

  • Click a diagram to see the parts shown on that diagram.
  • 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”.

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

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

Model diagram and schematic

SEARCH WITHIN THIS MODEL

?

This is the number corresponding to the part on the diagram / schematic

Search
ALL PARTS
Showing 10 of 96 parts  |

Tapping Bolt 178334
#88

Hydro transaxle diagram

Tapping bolt

Part #178334

Replaced by #587798701

?
Manufacturer substitution
This part replaces 178334. Substitute parts can look different from the original.
This item is not returnable
$5.31
16% OFF Phone Price : $6.31
In Stock
Lawn Tractor Transaxle Sealant 178322
#6

Hydro transaxle diagram

Lawn tractor transaxle sealant

Part #178322

In Stock
Compression 170417
#71

Hydro transaxle diagram

Compression

Part #170417

Replaced by #583001401

?
Manufacturer substitution
This part replaces 170417. Substitute parts can look different from the original.
This item is not returnable
In Stock
Miter Gear 150793
#38

Hydro transaxle diagram

Miter gear

Part #150793

Replaced by #583244201

?
Manufacturer substitution
This part replaces 150793. Substitute parts can look different from the original.
In Stock
Miter Gear 150792
#37

Hydro transaxle diagram

Miter gear

Part #150792

Replaced by #583244201

?
Manufacturer substitution
This part replaces 150792. Substitute parts can look different from the original.
In Stock
Retaining Ring 170405
#53

Hydro transaxle diagram

Retaining ring

Part #170405

Replaced by #583041601

?
Manufacturer substitution
This part replaces 170405. Substitute parts can look different from the original.
This item is not returnable
In Stock
Friction Stud 170421
#76

Hydro transaxle diagram

Friction stud

Part #170421

Replaced by #582998501

?
Manufacturer substitution
This part replaces 170421. Substitute parts can look different from the original.
In Stock
Spacer #2371 170411
#65

Hydro transaxle diagram

Spacer #2371

Part #170411

Replaced by #583001201

?
Manufacturer substitution
This part replaces 170411. Substitute parts can look different from the original.
This item is not returnable
In Stock
Expansion 173165
#128

Hydro transaxle diagram

Expansion

Part #173165

Replaced by #583057701

?
Manufacturer substitution
This part replaces 173165. Substitute parts can look different from the original.
In Stock
Bearing.30x5 173159
#19

Hydro transaxle diagram

Bearing.30x5

Part #173159

Replaced by #532150771

?
Manufacturer substitution
This part replaces 173159. Substitute parts can look different from the original.
In Stock

Most common symptoms to help you fix your dryers

Choose a symptom to see related dryer repairs.

Main causes: bad gas valve coils, broken heating element, tripped safety thermostat or fuse, bad operating thermostat, c…

Main causes: bad timer or electronic control board, door switch failure…

Main causes: lack of electrical power, bad power cord, wiring failure, bad control board, blown thermal fuse, bad door s…

Main causes: clogged exhaust vent, bad motor relay, loose dryer door catch, bad door switch, control system failure, fau…

Main causes: damaged door strike, worn door catch…

Main causes: bad drum support roller, damaged idler pulley, broken blower fan blade, worn drum glide bearing, bad drive …

Main causes: clogged exhaust system, heating system failure, deposits on moisture sensor, control system failure…

Main causes: door switch failure, lack of power, broken belt, blown thermal fuse, bad drive motor, control system failur…

Most common repair guides to help fix your dryers

These step-by-step repair guides will help you safely fix what’s broken on your dryer.

How to replace a thermal fuse in an electric dryer

How to replace a thermal fuse in an electric dryer

When the air in the dryer overheats—usually because the vent is clogged—the thermal fuse blows, stopping the dryer. You …

Repair difficulty
Time required
 15 minutes or less
How to install a thermal cut-off fuse kit in an electric dryer

How to install a thermal cut-off fuse kit in an electric dryer

The thermal cut-off fuse shuts off the heat if the dryer overheats when the high-limit thermostat fails. Install a ther…

Repair difficulty
Time required
 15 minutes or less
How to replace a dryer door switch

How to replace a dryer door switch

The dryer won't start if the door switch isn't working correctly. You can install a replacement dryer door switch in les…

Repair difficulty
Time required
 15 minutes or less

Effective articles & videos to help repair your dryers

Use the advice and tips in these articles and videos to get the most out of your dryer.

How to use your clothes dryer efficiently

How to use your clothes dryer efficiently

Get expert tips on using your dryer efficiently to save energy.…

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

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.…

Top questions about Sears and Sears PartsDirect

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…