Tecumseh Diesel Engine 1964–2002 Service Manual (P/N 691218)

• Tecumseh/Peerless gear-product coverage: 100 Series differentials; MST200; 300, 600/601, 700/700H, 800/801, 820, 900, 910, 915/940, 920, 930, 1200, and 2300 units; plus 1000/1100 right-angle and T-drives.
• Major shop procedures: model identification, pre-removal checks, unit teardown, internal inspection, reassembly, case sealing, lubrication, and final checks for binding, noise, and leakage.
• Geartrain and shifting service: covers shift keys and washers, shifter/brake shafts, countershafts, reverse chains and idlers, output shafts, differential assemblies, bearing blocks, bearing straps, seals, and bushings.
• Hydro-driven configurations: addresses 1300, 2400, 2500, and 2600 gear-reduction sections, including single- and dual-range arrangements, locking differentials, hydro-unit separation, and VST power-loss and hard-shift diagnosis.
• Factory reference data: includes model-specific lubrication and torque tables, bearing and bushing installation specifications, a shift-key quick-reference guide, sealant callouts, and the Peerless Tool Kit 670254A application chart.
• Exploded and labeled assembly views: examples include the 600 Series transaxle, 820 Series transmission, 915/940 Series transaxle, 1100 Series drive, single- and two-speed 2600 layouts, and the VST foot-control/differential-disconnect arrangement.

Publication and Model Identification

This is Tecumseh Products Company's January 2002 revision of the Tecumseh & Peerless Transmission and Drive Products Technician's Handbook, Form No. 691218 R 1/02. The handbook occupies a 124-page section of the PDF: a cover, safety notice, contents page, and 121 numbered service pages. Its gear products were used in industrial equipment and residential or commercial lawn-and-garden machinery. Tecumseh expressly states that the book is for properly trained technicians who have the proper tools and shop facilities, and directs anyone without Tecumseh training to an authorized servicing dealer.

Coverage is determined by the model and specification number on the tag, decal, or case stamping rather than by one blanket serial-number range. The identification section shows where those markings appear on the different housings and explains the date-of-manufacture code used on identified units built since 1964. This matters because similar-looking units can have different input locations, axle lengths, gear counts, rotation, brake placement, bearings, or internal washer arrangements.

Mechanical Repair and Troubleshooting Depth

The opening troubleshooting charts separate equipment-side problems from faults inside the transmission or transaxle. They cover hard or impossible shifting, jumping out of gear, axles that bind in neutral, loss of drive, and abnormal noise. Belt release, clutch and brake adjustment, shift linkage, pulley retainers, and belt guides are checked before the unit is removed, helping prevent an external tractor fault from being mistaken for an internal gear failure.

Series-specific chapters then follow the internal work. The procedures identify how the input, counter, shifter/brake, and output shafts relate to the gear train; how reverse-chain and reverse-idler systems differ; and how differentials, axle supports, seals, and case halves are inspected and reassembled. The manual also distinguishes important production configurations, including the extra bushings in the 940 versus the 915, alternate input and rotation arrangements in the 920/930 families, early and later 800 Series axle-bearing styles, and the single-range versus dual-range/locking-differential 2600 layouts.

The manual warns that Bentonite grease belongs on the gear train, not in needle or ball bearings, which require the specified bearing grease. It also shows how backward shift washers, reversed sprocket collars, or incorrect differential orientation can produce binding and premature shift-key or gear damage.

Tools, Specifications, and Scope Limits

The tool section identifies seal protectors, seal installers, bearing drivers, and bushing tools by service number. Examples include input-bearing installer 670251, countershaft bearing driver 670252, axle-seal protector 670262A, and angle-drive seal protector 670293. An arbor press, bearing pullers, torque wrench, and suitable holding fixtures are required for some repair operations.

The specification material is organized by unit rather than presented as generic drivetrain data. It includes approved lubricant types and capacities, component-specific fastener torque, bearing installation depths, inspection limits, shift-key dimensions, seal locations, and final rotation checks.

The sealed 300 Series is externally serviceable only. The handbook covers the mechanical gear-reduction side of hydro-powered units, but hydrostatic pump repair is referred to the equipment dealer or pump manufacturer; VST internal failures call for complete-unit replacement, so that chapter is diagnostic rather than an internal overhaul procedure. Equipment-specific brake, clutch, linkage, and installation adjustments still require the machine manufacturer's manual. Support the equipment securely during removal, keep lubricant off braking surfaces, and follow the equipment manufacturer's brake-adjustment instructions.