Husqvarna Z 254 Parts Manual

The Husqvarna Z 254 is a 54-inch zero-turn riding mower featuring a powerful 26 HP Kohler engine, hydrostatic transmission, fabricated 11-gauge steel deck, and ergonomic controls. This parts manual provides detailed diagrams, part numbers, and ordering information for maintenance, repair, and replacement of components. Below are key sections covering safety, identification, major assemblies, and ordering procedures.

1. Introduction & Safety 2. Model Identification 3. Deck Assembly & Cutting System 4. Engine & Drive System 5. Controls & Operator Station 6. Frame & Chassis 7. Electrical System 8. Belts & Pulleys 9. Fasteners & Hardware 10. Maintenance Schedule 11. Parts Ordering & Support

Introduction & Safety

This manual is intended for qualified service technicians and owners performing maintenance. Always prioritize safety.

Safety Symbol	Meaning
⚠️ WARNING	Indicates a hazardous situation which, if not avoided, could result in death or serious injury.
⚠️ CAUTION	Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
ℹ️ NOTE	Indicates important information for proper operation or maintenance.

WARNING! Always disconnect the spark plug wire before performing any maintenance or repair. Ensure the mower is on a level surface and the parking brake is engaged.

Model Identification

Locate your model and serial number to ensure correct parts ordering. The plate is located under the seat or on the frame.

Example Model: Z 254 (54")
Example Serial Number: 1234567890
Manufacture Date: YYWW (Year/Week)

CAUTION! Using incorrect parts can damage the mower and void the warranty. Always reference the correct model and serial number.

Deck Assembly & Cutting System

54-inch fabricated 11-gauge steel deck with three 18-inch blades.

Blade (P/N 532 40 66-25): 18-inch, 3-hole, high-lift. Torque to 40-45 ft-lbs.
Spindle Assembly (P/N 532 19 06-03): Includes bearing housing, pulley, and shaft.
Deck Shell (P/N 532 42 10-44): Main deck body, left side.
Deck Baffle (P/N 532 42 11-17): Grass discharge chute component.
Mandrel Belt (P/N 532 19 76-25): Deck drive belt, ½" x 95".

WARNING! Blades are extremely sharp. Handle with heavy gloves and use a blade holder during removal/installation.

Engine & Drive System

Engine Model: Kohler 7000 Series, 26 HP (e.g., KT740).
Air Filter (P/N 52 050 02-S): Dual-element paper filter.
Spark Plug (P/N 52 050 34-S): Champion RC12YC. Gap: 0.030".
Oil Filter (P/N 52 050 07-S): Spin-on type.
Hydrostatic Pump: Tuff Torq K66 transaxle.
Drive Belt (P/N 532 19 76-19): Main drive belt, ½" x 83".

Controls & Operator Station

Parts for the control levers, seat, and instrument panel.

Control Levers: Lap bar control assembly (P/N 532 19 26-01). Seat: High-back seat with suspension (P/N 532 17 57-01). Ignition Switch: Key start (P/N 532 13 90-01). Parking Brake Lever: (P/N 532 16 13-03). Footrest/Floor Pan: (P/N 532 42 12-11).

Frame & Chassis

Main frame, axle, and wheel components.

Main Frame (P/N 532 42 13-05): Welded steel chassis.
Front Axle (P/N 532 16 07-01): Pivoting axle assembly.
Front Wheel (P/N 532 16 15-01): 15 x 6.00-6 tire and wheel assembly.
Rear Wheel (P/N 532 16 16-01): 20 x 10.00-8 tire and wheel assembly.
Rollover Protection System (ROPS): (P/N 532 42 14-02) - If equipped.

Tip: Inspect the frame for cracks or damage regularly, especially after striking objects.

Electrical System

Battery, wiring harness, and safety switches.

Battery: 12V, 280 CCA (P/N 532 13 26-01).
Starter Motor: (P/N 532 13 92-01).
Alternator: 15 Amp (P/N 532 13 93-01).
Main Wiring Harness (P/N 532 13 95-02): Connects all electrical components.
Seat Safety Switch (P/N 532 13 83-01): Prevents operation without operator.
Blade Engagement Switch (P/N 532 13 84-01): PTO switch.

WARNING! Disconnect the battery negative terminal before working on the electrical system to prevent shorts or shocks.

Belts & Pulleys

Drive and deck belt routing diagrams and part numbers.

Belt Description	Part Number	Size
Main Drive Belt	532 19 76-19	1/2" x 83"
Deck Mandrel Belt	532 19 76-25	1/2" x 95"
Idler Pulley	532 19 06-12	4.5" diameter
Spindle Pulley	532 19 06-15	4.0" diameter

Fasteners & Hardware

Common bolts, nuts, and clips. Always replace with OEM grade hardware.

Blade Bolt (P/N 532 40 66-26): Grade 8, 5/16"-24 x 1.25".
Spindle Bolt (P/N 532 19 06-25): 3/8"-16 x 1".
Deck Hanger Clip (P/N 532 42 11-25): Spring clip for deck height adjustment.
Wheel Bearing Kit (P/N 532 16 17-01): For front wheels.

CAUTION! Do not reuse worn or damaged fasteners. Improper torque can lead to component failure.

Maintenance Schedule

Recommended part replacement intervals.

Component	Interval	Part Number
Engine Oil	First 5 hrs, then every 100 hrs	SAE 10W-30
Oil Filter	Every 200 hrs	52 050 07-S
Air Filter	Every 50 hrs (clean), 300 hrs (replace)	52 050 02-S
Spark Plug	Every 100 hrs	52 050 34-S
Blades	Sharpen every 25 hrs, inspect for damage	532 40 66-25
Drive Belts	Inspect every 50 hrs, replace if cracked/worn	See Section 9

Parts Ordering & Support

Issue	Action	Contact/Reference
Identify Part	Use diagrams in this manual and locate Part Number (P/N).	Refer to relevant section above.
Order Parts	Contact an authorized Husqvarna dealer with Model/Serial Number and P/N.	Find a dealer: www.husqvarna.com/us/dealer-locator
Technical Support	For installation or repair questions.	Call Husqvarna USA: 1-800-487-5952
Manual Downloads	Access the latest manuals and diagrams.	www.husqvarna.com/us/support/manuals

Warranty: Refer to your original warranty document for terms and conditions. Using non-genuine parts may affect warranty coverage.