Skip to main content

PROLINE™ 54 in. (137 cm) Mid-Size Mower

PROLINE™ 54 in. (137 cm) Mid-Size Mower

PROLINE™ 54 in. (137 cm) Mid-Size Mower

Product Information

Model #: 44427
Serial #: 422000000 - 999999999
Product Type: Walk Behind Mowers

Parts

Search for a part within assembly drawings:

Showing Results

Drawing Title	Part Number	Description
Title

54 Inch Deck Assembly

54 Inch Deck Assembly

Brake Assembly

Brake Assembly No. 138-5844

Brake Assembly No. 138-5844

Deck Cover Assembly

Deck Cover Assembly

Deck Decal Assembly No. 138-6880

Deck Decal Assembly No. 138-6880

Deck Lift Assembly

Deck Lift Assembly

Electrical Harness and Battery Assembly

Electrical Harness and Battery Assembly

Engine Assembly

Engine Assembly

Frame Assembly

Fuel System Assembly

Fuel System Assembly

Idler Arm Assembly No. 139-2899

Idler Arm Assembly No. 139-2899

LH Handle Control Assembly No. 139-1487

LH Handle Control Assembly No. 139-1487

LH Transmission Assembly No. 147-0362

LH Transmission Assembly No. 147-0362

Operator Control Assembly

Operator Control Assembly

Reference Bar Assembly No. 139-1475

Reference Bar Assembly No. 139-1475

RH Control Handle Assembly No. 139-1532

RH Control Handle Assembly No. 139-1532

RH Transmission Assembly No. 147-0363

RH Transmission Assembly No. 147-0363

Spindle Assembly No. 139-2357

Spindle Assembly No. 139-2357

Transmission Assembly

Transmission Assembly

Download Parts Catalog

Manuals

Operator's Manual

Parts Catalog

Product Warranty

Quick Start Guide

Accessories (22)

Hypr-Oil™ 500 (quart)

Hypr-Oil™ 500 (quart) (Part # 114-4713)

Hypr-oil™ 500 (quart). Toro Hypr-Oil 500 is a high-performance hydraulic fluid specifically formulated and approved by Toro engineering for use in Toro commercial zero turn mowers. It provides excellent wear and corrosion protection for hydraulic systems, helping to maintain consistent performance and extend the service life of hydraulic components. Always refer to your operator manual for the correct fluid specification and service intervals.

Hypr-Oil™ 500 (gallon)

Hypr-Oil™ 500 (gallon) (Part # 114-4714)

Toro Hypr-Oil 500 is a high-performance hydraulic fluid specifically formulated and approved by Toro engineering for use in Toro commercial zero turn and stand-on mower hydraulic systems. Maintaining the correct hydraulic fluid and changing it at the manufacturer-recommended interval is critical to protecting hydraulic pumps, wheel motors, and other hydraulic components from wear and corrosion — particularly on machines operating under commercial duty cycles. Refer to your operator manual for the correct change interval and fluid capacity for your equipment.

Genuine OEM Part 114-4715

Hypr-Oil™ 500 Hydraulic Oil (5 gallon) (Part # 114-4715)

Toro Hypr-Oil 500 is a high-performance hydraulic fluid formulated and approved by Toro engineering for commercial zero turn and stand-on mower hydraulic systems. The 5-gallon commercial bulk pack is designed for fleet operators and service shops performing multiple machine hydraulic fluid changes. Maintaining the correct hydraulic fluid on schedule protects pumps, wheel motors, and other hydraulic components from accelerated wear. Refer to your operator manual for the correct change interval and capacity for each machine. Do not mix with other hydraulic fluids.

Genuine OEM Part 131-6572

Premium Fuel Treatment (12 oz.) (Part # 131-6572)

Toro Premium Fuel Treatment helps ensure clean, reliable engine performance and protection. Toro Premium Fuel Treatment is designed to protect small 2-cycle and 4-cycle engines from the effects of ethanol-blended fuels, which can degrade over time and leave harmful deposits in carburetors and fuel systems. Using a fuel stabilizer with every fill-up is particularly important for equipment that sits unused for extended periods, such as mowers stored over winter.

Genuine OEM Part 133-1438

GrandStand Electric Accessory Port (Part # 133-1438)

Toro OEM electric access port provides an electric outlet to charge small onboard devices. Verify your model and serial number to confirm compatibility before ordering.

Genuine OEM Part 138-6866

Weight Kit (Part # 138-6866)

This Toro OEM weight kit helps improve traction and stability on slopes and uneven terrain by adding ballast to the front or rear of your mower. Verify your model and serial number to confirm compatibility before ordering.

Genuine OEM Part 138-8885-03

18.75 Inch Mulching Blade (Part # 138-8885-03)

This Toro OEM 18.75-inch mulching replacement blade features more pronounced curves and a longer cutting edge compared to standard discharge blades, enabling it to cut grass and immediately redirect clippings back into the deck for additional passes. The result is finely shredded clippings that settle into the lawn quickly and decompose into nutrients, reducing the need to bag or dispose of grass waste. Compatible with multiple Toro riding lawn mowers models — verify your model and serial number before ordering.

Genuine OEM Part 138-8889-03

18.75 Inch Hi-Flow Blade (Part # 138-8889-03)

This Toro OEM 18.75-inch Hi-Flow replacement mower blade is designed to produce high lift, cutting grass cleanly and propelling clippings upward and out through the discharge chute. Hi-Flow blades — also referred to as basic, standard, or 2-in-1 blades — are the preferred choice when using a grass catcher or bagger, as the increased airflow drives clippings efficiently into the collection bag. This blade is compatible with multiple Toro riding lawn mowers models — always verify your model and serial number before ordering to confirm the correct fit.

Genuine OEM Part 138-8892-03

18.75 Inch Hi-Flow Blade (Part # 138-8892-03)

This Toro OEM 18.75-inch Hi-Flow replacement mower blade is designed to produce high lift, cutting grass cleanly and propelling clippings upward and out through the discharge chute. Hi-Flow blades — also referred to as basic, standard, or 2-in-1 blades — are the preferred choice when using a grass catcher or bagger, as the increased airflow drives clippings efficiently into the collection bag. This blade is compatible with multiple Toro riding lawn mowers models — always verify your model and serial number before ordering to confirm the correct fit.

Genuine OEM Part 139-4063

Height of Cut (HOC) Brackets Kit (Part # 139-4063)

This genuine Toro OEM height-of-cut (HOC) bracket kit is designed to adjust the available mowing height range on compatible Toro mowers, allowing access to cutting heights below or above the standard deck adjustment range. This is particularly useful for operators whose mowing conditions require a lower or higher cut than the factory deck position allows. Verify your model and serial number before ordering.

Genuine OEM Part 139-5595

Wide Area Mower Light Kit (Part # 139-5595)

This genuine Toro OEM LED light kit is designed for Toro Wide Area Mowers and provides high-intensity, low-amperage illumination for commercial operators who mow in early-morning, evening, or low-light conditions. The cast aluminum housing and stainless steel hardware ensure durability under demanding commercial mowing schedules. Verify your model and serial number before ordering.

Genuine OEM Part 139-7860

Soft Side Bagger (Part # 139-7860)

This genuine Toro OEM soft-side bagger is designed to collect grass clippings directly from your Toro mower deck, keeping the lawn clear and eliminating the need to rake after mowing. Soft-side baggers are lighter and easier to handle than hard-sided alternatives and are ideal for homeowners who prefer a bagging setup over mulching. One of the most frequently purchased accessories at the time of a new mower purchase. Verify your model and serial number before ordering.

Genuine OEM Part 140-1915

54 inch Recycler Kit (Part # 140-1915)

By adding the Toro Recycler system to your Toro 54-inch mower, you create your own natural fertilizer. This patented system cuts grass clippings 6-8 times, turning them into a fine, nutrient-rich mulch to feed your lawn all season. Verify your model and serial number to confirm compatibility before ordering.

Genuine OEM Part 140-4300

Rubber Deflector Kit (Part # 140-4300)

This genuine Toro OEM replacement part is manufactured to the exact engineering specifications of your Toro equipment, ensuring correct fit and reliable performance. Verify your model and serial number to confirm compatibility before ordering.

Genuine OEM Part 140-5122

Titan Leaf Bagging Enhancement Kit (Part # 140-5122)

This bagging enhancement kit can be used with 50 inch Toro Titan riding mowers. It will enhance bagging performance in extreme conditions such as heavy, wet grass or autumn leaf bagging. This genuine Toro OEM bagging enhancement kit is designed to improve clipping collection performance in demanding conditions such as heavy or wet grass and autumn leaf bagging. Refer to your operator manual for installation instructions and compatible models.

Genuine OEM Part 140-7731

Recycler 18.75 Inch Blade Pack (6) (Part # 140-7731)

This Toro OEM 18.75-inch Recycler replacement mower blade — sold as a pack of 6 is built to work within Toro's Recycler mulching system, featuring uniquely shaped 'accelerator' wings that act as a fan to keep clippings circulating beneath the deck. As clippings are forced back into the cutting zone, they are re-cut multiple times into fine pieces that fall back into the lawn and break down into natural fertilizer — feeding the grass and reducing the need to bag or rake. Compatible with multiple Toro riding lawn mowers models — verify your model and serial number before ordering.

Hi-Flow 18.75 Inch Blade Pack (6)

Hi-Flow 18.75 Inch Blade Pack (6) (Part # 140-7735)

This Toro OEM 18.75-inch Hi-Flow replacement mower blade — sold as a pack of 6 is designed to produce high lift, cutting grass cleanly and propelling clippings upward and out through the discharge chute. Hi-Flow blades — also referred to as basic, standard, or 2-in-1 blades — are the preferred choice when using a grass catcher or bagger, as the increased airflow drives clippings efficiently into the collection bag. This blade is compatible with multiple Toro riding lawn mowers models — always verify your model and serial number before ordering to confirm the correct fit.

Hi-Flow 18.75 Inch Blade Pack (6)

Hi-Flow 18.75 Inch Blade Pack (6) (Part # 140-7739)

This Toro OEM 18.75-inch Hi-Flow replacement mower blade — sold as a pack of 6 is designed to produce high lift, cutting grass cleanly and propelling clippings upward and out through the discharge chute. Hi-Flow blades — also referred to as basic, standard, or 2-in-1 blades — are the preferred choice when using a grass catcher or bagger, as the increased airflow drives clippings efficiently into the collection bag. This blade is compatible with multiple Toro riding lawn mowers models — always verify your model and serial number before ordering to confirm the correct fit.

10W30 4-Cycle Engine Oil - 32 oz. Bottle

10W30 4-Cycle Engine Oil - 32 oz. Bottle (Part # 38280)

The Toro 38280 Premium 4-Cycle Lawn Mower Engine Oil 10W-30 is specially formulated to meet specific 4-cycle engine manufacturer requirements calling for 10W-30. This lawn mower engine oil provides the ultimate protection for all 4-cycle OPE engines. The lawn mower engine oil is developed with Toro engineering to meet the standards for all air-cooled, liquid-cooled and diesel engines. To maximize the performance of your Toro lawn mower, we highly recommend using this Toro lawn mower engine oil, which has been specifically formulated for best results. The lawn mower engine oil provides extreme performance in all temperatures, enhancing the life of your lawn mower's engine.

SAE 30 4-Cycle Lawn Mower Engine Oil 32 oz

SAE 30 4-Cycle Lawn Mower Engine Oil 32 oz (Part # 38903)

Toro SAE 30 4-cycle engine oil passed the strictest requirements in thousands of hours of testing in hundreds of engines before you filled your lawn mower. This oil meets or exceeds performance requirements of all OEM engines (Toro, Briggs & Stratton, KOLHER, Honda, and Tecumseh). The use of Toro SAE 30 4-cycle lawn mower oil minimizes molecular shearing for extended life in hot-air-cooled applications vs multi-grades (i.e., 10W-30).

TWO-WHEEL SULKY, PROLINE MIDSIZE (Part # 44401)

Spark Arrestor (Part # 98-9099)

Toro OEM spark arrestor prevents carbon build ups from being ejected from the engine and igniting a fire. Verify your model and serial number to confirm compatibility before ordering.

Product Details

Model #

44427

Serial #

422000000 - 999999999

Product Name

PROLINE™ 54 in. (137 cm) Mid-Size Mower

Product Brand

Toro

Product Type

Walk Behind Mowers

Chassis Type

Walk Behind

Swath

54 inch

Discharge

Side

Engine/Motor Manufacturer

Kawasaki

Engine/Motor Size

18.5 hp

Engine/Motor Type

4 Cycle

Engine Starter

Electric

Transmission Type

Hydrostatic

Traction Type

Rear WD