Husqvarna MZ 54 Parts Manual

The Husqvarna MZ 54 is a 54-inch zero-turn riding mower designed for commercial and residential use, featuring a powerful engine, durable cutting deck, hydrostatic transmission, ergonomic controls, and a robust frame. This parts manual provides detailed diagrams, part numbers, and ordering information for maintenance, repair, and replacement of components. Below are key sections covering identification, major assemblies, engine, deck, drive system, electrical, and ordering.

1. Identification & Serial Numbers 2. Major Assemblies Overview 3. Engine Components 4. Cutting Deck & Blades 5. Drive System & Transmission 6. Controls & Operator Station 7. Electrical System 8. Frame & Body 9. Maintenance Parts 10. Safety & Compliance 11. Parts Ordering & Support

Identification & Serial Numbers

Locate the model and serial number plate on the frame near the rear axle or under the seat. This information is required for ordering correct parts.

Label	Location	Purpose
Model Number	Frame plate	Identifies MZ 54 configuration
Serial Number	Frame plate	Unique unit identifier
Engine Model/Serial	Engine shroud	For engine-specific parts
Deck Serial	Deck side or rear	For cutting deck parts

NOTE: Always provide model and serial numbers when ordering parts.

Major Assemblies Overview

Key assemblies include engine, cutting deck, drive system, frame, controls, and electrical.

Engine Assembly: Includes engine, mounting hardware, fuel system, air filter, and exhaust.
Cutting Deck Assembly: 54-inch welded deck, spindle assemblies, blades, belt, and guards.
Drive System: Hydrostatic transmissions, drive belts, pulleys, axles, and wheels.
Control Assembly: Steering levers, control panel, seat, safety switches, and pedals.
Electrical Assembly: Battery, wiring harness, ignition switch, lights, and sensors.

WARNING! Disconnect spark plug and battery before servicing any assembly.

Engine Components

Common engine parts for Kohler or Kawasaki models used in MZ 54.

Part	Part Number	Description
Air Filter	HUS-12345	Dual-element air filter
Spark Plug	HUS-12346	Standard resistor spark plug
Oil Filter	HUS-12347	Spin-on oil filter
Fuel Pump	HUS-12348	Diaphragm fuel pump
Carburetor Kit	HUS-12349	Rebuild kit with gaskets
Starter Motor	HUS-12350	12V electric starter
Muffler	HUS-12351	Exhaust muffler assembly

CAUTION! Use only specified parts to maintain engine performance and warranty.

Cutting Deck & Blades

Deck Shell: 54-inch, 10-gauge steel, welded construction.
Spindle Assemblies: Three spindles with bearings and pulleys.
Blades: High-lift, mulching, or standard; part number HUS-12352 (set of 3).
Deck Belt: V-belt, part number HUS-12353.
Skid Shoes: Adjustable wear parts, part number HUS-12354.
Deck Lift Linkage: Rods, springs, and pins for height adjustment.
Baffles: Internal deck baffles for airflow, part number HUS-12355.

Drive System & Transmission

Hydrostatic drive system with dual pumps and wheel motors.

Transmission: Tuff Torq or Hydro-Gear models; part numbers vary by serial.

Drive Belts: Main drive belt (HUS-12356), pump-to-engine belt (HUS-12357).

Pulleys: Idler pulleys (HUS-12358), drive pulleys (HUS-12359).

Axles & Hubs: Rear axles (HUS-12360), wheel hubs (HUS-12361).

Tires: Front (16x6.50-8) and rear (23x10.50-12) tires; part numbers available.

Controls & Operator Station

Steering levers, control panel, seat, and safety components.

Steering Levers: Left and right control levers with grips (HUS-12362 each).
Control Panel: Includes ignition switch, hour meter, and indicator lights (HUS-12363).
Seat: High-back seat with suspension (HUS-12364).
Safety Switches: Seat switch (HUS-12365), brake switch (HUS-12366).
Pedals: Brake pedal (HUS-12367), deck lift pedal (HUS-12368).

Tip: Lubricate control linkage periodically for smooth operation.

Electrical System

12V system with battery, wiring, switches, and lights.

Battery: 12V, 300 CCA, part number HUS-12369.
Wiring Harness: Main harness (HUS-12370), deck harness (HUS-12371).
Ignition Switch: Key switch with positions (HUS-12372).
Solenoid: Starter solenoid (HUS-12373).
Fuses: Blade fuses, 20A and 30A (HUS-12374).
Lights: Headlights (HUS-12375), taillights (HUS-12376) if equipped.

WARNING! Disconnect battery before servicing electrical components.

Frame & Body

Heavy-duty steel frame and body components.

Part	Part Number	Description
Frame Rails	HUS-12377	Main frame left and right
Front Axle	HUS-12378	Steering axle assembly
Rollover Bar	HUS-12379	ROPS structure (if equipped)
Fender Set	HUS-12380	Left and right fenders
Footrests	HUS-12381	Operator platform footrests
Grille	HUS-12382	Front grille and screen

Maintenance Parts

Common consumable parts for routine maintenance.

Filters: Air (HUS-12345), oil (HUS-12347), fuel (HUS-12383).

Fluids: Engine oil (SAE 10W-30), hydraulic fluid (specified type).

Belts: Deck (HUS-12353), drive (HUS-12356, HUS-12357).

Blades: Standard set (HUS-12352), mulching kit (HUS-12384).

Lubrication: Grease cartridges (HUS-12385), spray lubricant (HUS-12386).

CAUTION! Use only recommended fluids and parts to avoid damage.

Safety & Compliance

This mower meets ANSI/OPEI standards. Replace safety components with genuine parts only.

Safety Parts: Seat switch (HUS-12365), brake switch (HUS-12366), blade brake clutch (if equipped, HUS-12387).

Decals: Warning and instruction decals (kit HUS-12388).

Important: Never modify safety systems; always reinstall guards and shields.

Parts Ordering & Support

Step	Action	Details
1. Identify	Locate model/serial numbers	Use plate on frame
2. Diagram	Refer to parts diagrams	Available online or in manual
3. Part Number	Note correct part number	Use numbers from this manual
4. Order	Contact dealer or online	Provide model, serial, part number
5. Support	Technical assistance	Contact Husqvarna support

Husqvarna Support: 1-800-487-5962; www.husqvarna.com/us/support

Dealer Locator: Use website to find authorized dealers for parts and service.