🏷️ Basic Information

Make:

Ariens

Model:

939 Series Sno-Thro

Product Type:

Service Workshop Repair Manual

Format:

PDF Download

Model Coverage Prefix:

939

Covered Model Numbers:

939001 (ST520E), 939002 (ST520), 939300 (ST520)

👋 Introduction

Product Category:

Heavy-duty residential snow removal equipment

Segment Type:

Two-stage snowthrowers (snowblowers)

Manual Utility:

Empowers DIY servicing for complex repairs, reducing reliance on professional service.

Digital Convenience:

Instant access, portability, searchable content, eco-friendly (no shipping).

Manual Clarity:

Emphasizes clarity and detail in its descriptions and visuals, crucial for technical repair manuals.

Snowblower Vs Snowthrower:

This manual covers 'Sno-Thro' models, which are typically two-stage 'snowblowers' as per industry convention. The manual focuses on the mechanical aspects of the machine, distinct from engine-specific repairs.

📋 Manual Details

Primary Focus:

Machine repair and servicing, excluding engines

Secondary Focus:

General maintenance, adjustments, teardowns, specifications

Total Pages:

33

Type:

Workshop Repair Manual

Purpose:

Complex repairs, do-it-yourself servicing

Language:

English

Digital Features:

Zoomable, printable, savable, bookmark navigation

Download Access:

Instant link via email upon purchase.

📖 Manual Coverage

Drive System:

Transmission, Gear Case

Snow Handling System:

Auger / Impeller

Control System:

Handlebars & Controls

Chassis And Frame:

General Maintenance & Adjustments, Service & Adjustments

General Specs:

Specifications

Engine Section Note:

Dedicated 'Engine' section is listed in the index, but the product description explicitly states 'excluding engines,' suggesting this section may contain mounting or accessory interface information rather than internal engine repair.

Routine Maintenance:

General Maintenance & Adjustments, Lubrication points, Tensioning

Repairs:

Teardowns, Component Replacement (Auger, Impeller, Gear Case, Controls), Reassembly

Diagnostics:

Troubleshooting guidance implied through detailed repair steps

Adjustments:

Service & Adjustments, Control cable adjustments, Drive belt tensioning

Depth:

Comprehensive, detailed repair information, technical manual

Detail Level:

High detail with clear, clean pictures

Diagnostic Focus:

Focus on mechanical diagnostics and repair procedures

📊 Manual Specifications

Format:

PDF

Software Compatibility:

Adobe Acrobat Reader (free download available)

Image Clarity:

Very clear and clean pages with detailed pictures

Text Readability:

High, suitable for technical use

Physical Binding:

N/A (Digital)

Physical Paper:

N/A (Digital)

Bookmarks:

Yes, for fast and easy navigation

⚙️ Engine Specifications

Engine Coverage:

Engine repair manuals sold separately. This manual excludes engine-specific repair procedures.

Engine Type Implied:

Likely air-cooled gasoline engines, common for Ariens snowblowers of this era.

Fuel Type Implied:

Gasoline

🔧 Transmission

Transmission Type:

Covered in 'Transmission' section, likely a multi-speed gearbox for auger and drive engagement.

Optional Features:

Not specified, but commonly featured speed selection for varying snow conditions.

Drive Mechanism:

The manual details the transmission and gear case, implying mechanical drive systems.

📐 Dimensions

Clearing Width:

Implied by model numbers (ST520 series suggests approximately 20-24 inches, but not explicitly stated in manual description).

Unit Weight:

Not specified in manual description. Typical for this class of machine would be 150-250 lbs.

🛡️ Safety Features

Safety Standards:

Manual includes a dedicated 'Safety' section, indicating adherence to operational safety protocols.

Operator Controls:

Handlebars & Controls section covers operation, implying safety interlocks and control mechanisms.

Machine Design:

The detailed repair information suggests safety considerations in component design and assembly.

💡 Technology Features

Features:

N/A (This is a mechanical equipment manual, not a vehicle with infotainment systems).

Features:

N/A (This is a mechanical equipment manual, not a vehicle with driver assistance systems).

Features:

N/A (This is a mechanical equipment manual, not a vehicle with connectivity features).

🔧 Maintenance

Scheduled Maintenance:

Covered in 'General Maintenance & Adjustments' section, likely includes lubrication, belt checks, and shear pin inspection (intervals not specified in product description).

Gear Case Lubricant:

Not specified in product description, but typically SAE 30 or 90W gear oil depending on design.

Grease Points:

Implied by 'General Maintenance & Adjustments' section.

Common Wear Items:

Shear pins, auger drive belts, impeller bearings, drive belts are common wear items for this type of equipment.

Common Adjustments:

Control cable tension and alignment are frequent adjustment points for optimal operation.

Diagnostic Approach:

The manual's detailed repair procedures facilitate troubleshooting of mechanical issues.

📚 Vehicle History

Company Founding:

1933, by Henry Ariens and his sons, initially focused on agricultural equipment.

Early Innovation:

Pioneered the first American-made rotary tiller and multi-row Tillivator.

Sno Thro Introduction:

Ariens entered the snow thrower market in 1960, with the first Sno-Thro prototype completed in March 1960.

Sno Thro Milestone:

Produced its 2 millionth Sno-Thro machine in November 2005.

Core Values:

Be Honest, Be Fair, Keep Our Commitments, Respect the Individual, Encourage Intellectual Curiosity.

🏆 Awards & Recognition

Brand Recognition:

Ariens is recognized for durability and innovation in the outdoor power equipment market, particularly with its Sno-Thro line.

Product Quality:

The manual description highlights 'very clear and clean, pictures are great with detail, alot of detailed repair information,' indicating a high-quality documentation standard.