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21-048
Steiner 21-048 seal.
Shown in the parts diagrams for the Sundstrand Series 15 pump / hydraulic pump assembly. Commonly used on various Steiner 410, 415, 420, 425, 430, and 4300-series units (including Jacobsen-branded models).
Please confirm compatibility by matching your model and the related diagram location.
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This part fits your tractor
This part fits 23 models
Installation Tips
1 Quart Trans-Hydraulic Oil (Transmission & Hydraulic Fluid)
Part# 15-012
53
in Stock
$10.69
Fast Orange Hand Cleaner - 7.5oz
Part# FAST25108
4
in Stock
$3.14
3.5 Gallon Trans-Hydraulic Oil for Hydraulic Systems & Transmissions
Part# 15-015
28
in Stock
$114.85
Performance Tool Hex Head Drill Screw Set - 200pc
Part# PERFW5220
3
in Stock
$15.01
70 Piece Grease Fitting Assortment
Part# PERFW5215
2
in Stock
$16.53
Deluxe Steering Wheel Spinner Knob for Tractors
Part# 77700-01540
100+
in Stock
$13.23
Kubota Stainless Steel 1-1/4" Scraper
Part# 77700-02478
14
in Stock
$7.95
Kubota Mini Lever Action Grease Gun
Part# 77700-03644
3
in Stock
$30.14
RACKS360 - Roll Bar Tool Carrying System
Part# RACKS360
18
in Stock
$139.99
1 Quart Trans-Hydraulic Oil (Transmission & Hydraulic Fluid)
Part# 15-012
53
in Stock
$10.69
Fast Orange Hand Cleaner - 7.5oz
Part# FAST25108
4
in Stock
$3.14
3.5 Gallon Trans-Hydraulic Oil for Hydraulic Systems & Transmissions
Part# 15-015
28
in Stock
$114.85
Performance Tool Hex Head Drill Screw Set - 200pc
Part# PERFW5220
3
in Stock
$15.01
70 Piece Grease Fitting Assortment
Part# PERFW5215
2
in Stock
$16.53
Deluxe Steering Wheel Spinner Knob for Tractors
Part# 77700-01540
100+
in Stock
$13.23
Kubota Stainless Steel 1-1/4" Scraper
Part# 77700-02478
14
in Stock
$7.95
Kubota Mini Lever Action Grease Gun
Part# 77700-03644
3
in Stock
$30.14
RACKS360 - Roll Bar Tool Carrying System
Part# RACKS360
18
in Stock


I have a 1997 Hustler 2500 with a 72” deck that works perfect for my property. I was able to replace both hydraulic pump input shaft seals by jacking up the mower, crawling underneath, and replacing the seals without taking the pumps off! What a blessing. I just took off the belt, loosened the two square-head set screws on each pulley, drilling a small hole in each seal and extracting the seals with a small screw and slide hammer. Installing the seals was easy. Just tapped them in with a socket and small hammer. Didn’t even need to drain the hydraulic tank! Easy peasy!
ELVERSON, PA
David