Hydro-Gear
Engine & Drivetrain

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

Here are the diagrams and repair parts for 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.

Showing 10 of 96 parts

Lawn Tractor Brake Disc (replaces 170408)#59

Hydro transaxle Diagram

Transaxle rotor brake

Part #170408
Replaced by #583041801
?
Manufacturer substitution
This part replaces 170408. Substitute parts can look different from the original.
In Stock
$25.47 | 
20% OFF 
MSRP: $32.00
Lawn Tractor Brake Pad Plate (replaces 142882)#60A

Hydro transaxle Diagram

Puck

Part #142882
Replaced by #532142882
?
Manufacturer substitution
This part replaces 142882. Substitute parts can look different from the original.
This item is not returnable
In Stock
$4.99 | 
17% OFF 
Phone Price: $5.99
Lawn Tractor Retainer Ring#40

Hydro transaxle Diagram

Spiral ring

Part #170393
Replaced by #583040901
?
Manufacturer substitution
This part replaces 170393. Substitute parts can look different from the original.
This item is not returnable
In Stock
$5.29 | 
16% OFF 
Phone Price: $6.29
Lawn & Garden Equipment Engine Oil Seal (replaces 170390)#34

Hydro transaxle Diagram

Lip seal axle

Part #170390
Replaced by #583040601
?
Manufacturer substitution
This part replaces 170390. Substitute parts can look different from the original.
This item is not returnable
In Stock
$10.49 | 
16% OFF 
Phone Price: $12.49
Lawn Tractor Transaxle Filter Kit#125

Hydro transaxle Diagram

Filter assembly

Part #170445
Replaced by #583056801
?
Manufacturer substitution
This part replaces 170445. Substitute parts can look different from the original.
In Stock
$41.99
Lawn Tractor Transaxle Wheel Axle, Left (replaces 170392)#36

Hydro transaxle Diagram

Axle

Part #170392
Replaced by #583040801
?
Manufacturer substitution
This part replaces 170392. Substitute parts can look different from the original.
In Stock
$94.69 | 
21% OFF 
MSRP: $120.00
Lawn Tractor Screw#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
In Stock
$3.09 | 
24% OFF 
Phone Price: $4.09
Lawn Tractor Brake Dowel Pin#62

Hydro transaxle Diagram

Brake actuator

Part #170409
Replaced by #532142887
?
Manufacturer substitution
This part replaces 170409. Substitute parts can look different from the original.
This item is not returnable
In Stock
$2.89 | 
26% OFF 
Phone Price: $3.89
Lawn Tractor Transaxle Expansion Tank Hose#85

Hydro transaxle Diagram

Lawn tractor transaxle expansion tank hose

Part #170426
This item is not returnable
In Stock
$7.33
Lawn Tractor Brake Compression Spring#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
$7.18