Allis Chalmers 616 620 720 4040 4041 9020 Pow'r Max Tractor Repair Manual & Parts Catalog 1972-1985
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Sample pages from the Allis Chalmers 616 620 720 4040 4041 9020 Pow'r Max Tractor Repair Manual & Parts Catalog 1972-1985 manual
Purchase Information
Technical Specifications
- Document Number / Seller:
- 30145 / William Sanchez
- File Size:
- 13.53 MB
- File Type:
- ZIP
- Language:
- English
- Pages:
- 120
- Printable:
- Yes
- Estimated Download Time:
- 0.28 Minutes
- Delivery Format:
- Digital (PDF) - Instant Access
- Category:
- Tractor
- Brand:
- Allis Chalmers
- Reviewed and Approved:
- Dec 28, 2025
Allis Chalmers Models and Parts Covered in this Tractor Manual
- Model 616 (1972-1973)
- Model 620 (1973-1975)
- Model 720 (1974-1985)
- Model 4040 (1972-1973)
- Model 4041 (1973-1974)
- Model 9020 (1975-1985)
- Pow'r Max (1973-1985)
Complete Manual Information
Allis Chalmers 616, 620, 720 & Pow'r Max Tractor Service Manual & Parts Catalog (1972-1985)
Restore, maintain, and operate your vintage heavy-duty garden tractor with the same technical authority as a factory technician. This comprehensive digital collection combines the full Service Manual (Volume 1 & 2) and the complete illustrated Parts Catalog into one definitive resource. Covering the legendary "large frame" series that bridged the gap between garden tractors and agricultural machinery, this guide is indispensable for owners of the Allis Chalmers and Simplicity-branded twins.
Comprehensive Model & Serial Number Coverage
This manual is specifically engineered for the high-performance chassis produced during the peak of Allis Chalmers garden tractor engineering. It covers the following specific models and manufacturing numbers found in the documentation:
- Model 616 (1972-1973): Mfg. No. 2020185
- Model 620 (1973-1975): Mfg. Nos. 2020303, 2020304
- Model 720 (1974-1985): Mfg. Nos. 1690073, 1690231, 1690288
- Cross-Compatible Models: Provides full technical coverage for the Allis Chalmers 4040, 4041, and 9020, as well as the Simplicity Pow'r Max series.
Deep-Dive Technical Specifications
These tractors were engineered for heavy ground engagement and industrial use. This manual provides the granular detail required to service their sophisticated systems:
- Onan Twin-Cylinder Engines: Complete overhaul and tuning data for the CCK and NH series engines. Includes critical specs for valve seat grinding, piston clearance, and governor synchronization to maintain that signature smooth power delivery.
- Sundstrand Hydrostatic Drive: Detailed troubleshooting for the heavy-duty hydrostatic transmission. Learn how to perform pressure tests, service the charge pump, and adjust the relief valves to ensure maximum torque to the rear wheels.
- Precision Hydraulics: Step-by-step instructions for the front and mid-mount hydraulic lift systems, including the optional 3-point hitch and remote outlets.
- Electric PTO & Charging: Full wiring schematics and testing procedures for the front, center, and rear PTO clutches, as well as the 15-amp and 20-amp charging systems.
Integrated Illustrated Parts Catalog
Eliminate the guesswork when ordering replacement components. The included parts manual features:
- Exploded View Diagrams: Clear, high-resolution illustrations showing how every sub-assembly fits together—perfect for reassembling a project tractor.
- Official Part Numbers: Direct access to the original AC part numbering system for seals, bearings, and specialized hardware.
- Numerical Index: A complete cross-reference tool to locate specific parts across different tractor sections quickly.
Essential Service Chapters
- General Information: Lubrication charts, fluid capacities (7 quarts for the transmission/hydraulic system), and bolt torque sequences.
- Engine Repair: Teardown of the Onan CCKA and CCKB powerplants, including crankshaft and camshaft tolerances.
- Fuel & Governor: Carburetor rebuilding for Zenith and Marvel Schebler units, plus fuel pump pressure testing.
- Transmission & Differential: Detailed service of the final drive and the limited-slip differential.
- Steering & Brakes: Adjustment of the heavy-duty steering gear and the external band-type brakes.
- Electrical System: Ignition timing, starter motor repair, and complete tractor-wide wiring diagrams.
- Hydraulic Pump & Valves: Comprehensive repair of the hydraulic control valve and cylinder seals.
The Ultimate Restoration Tool
Whether you are performing a basic tune-up or a ground-up restoration, this manual provides the clearance tolerances, shim pack requirements, and specialized technical insights that are not found in standard aftermarket guides. This documentation ensures your Allis Chalmers 720 or Pow'r Max continues to perform as a versatile workhorse for decades to come.
Download Instructions for Allis Chalmers Tractor Manual
Frequently Asked Questions - Allis Chalmers Tractor Manual
Is this manual suitable for beginners?
Yes, this Allis Chalmers manual is designed for both professional technicians and DIY enthusiasts. It includes step-by-step procedures with clear illustrations and safety guidelines for Tractor maintenance and repair.
What file format will I receive?
You will receive this manual as a ZIP file (13.53 MB), which is compatible with all devices. The manual is fully searchable and printable for your convenience.
How quickly can I access the manual after purchase?
You'll receive instant access to your Allis Chalmers Tractor manual immediately after payment completion. The download link is valid for 3 days, with lifetime re-download guarantee.
Does this include hydraulic system information?
Yes, this equipment manual covers hydraulic system operation, maintenance procedures, and troubleshooting for your Allis Chalmers machinery.
Can I print specific sections of the manual?
Absolutely! This digital manual allows you to print any section you need, from individual pages to complete chapters, making it perfect for workshop use.
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