Toro Groundsmaster 345/322-D/325-D/328-D Mower 1992-2007 Service Manual (P/N 92801SL)

This Toro Groundsmaster 300 Series service manual, P/N 92801SL, Revision I, covers the 345, 322-D, 325-D, and 328-D traction units, with model-specific engine coverage and separate sections for the covered cutting units.

PDF Search, Bookmarks, and Wiring Detail

Search and diagram access: Text search works across the main service sections, but some troubleshooting charts and early wiring sheets are not text-searchable. Embedded bookmarks provide chapter and section navigation; three engine-manual links point to separate files outside this download. Small wiring labels require zooming, and the 328-D schematic has faint gray component labels and lines.

One printable, English-language 402-page PDF. The total includes the cover/preface, contents pages, maintenance and service-record forms, back cover, and five blank or otherwise empty pages.

Engine, Hydrostatic Drive, and Cutting-Unit Service

The following is a selection of covered work, rather than a complete contents list. Other included material covers hydraulic fitting installation and towing precautions.

• Engine service: Ford governor adjustment and engine removal; Mitsubishi fuel-system diagnosis, internal overhaul, and reassembly; Kubota specifications and traction-unit engine removal references.

• Hydraulics: Pressure and flow testing, hydrostatic transmission overhaul and priming, lift-cylinder and lift-valve repair, and traction-control adjustments.

• Electrical diagnosis: Model- and serial-specific wiring schematics, starting and operating fault charts, safety-interlock verification, component tests, and later relay/module coverage.

• Differential and 4WD axles: Dana differential repair, Inasaka over-running clutch service, and Dae Dong axle, gear-contact, and bidirectional-clutch procedures.

• Steering and brakes: Steering-valve and cylinder testing, bearing and bushing service, toe-in adjustment, brake adjustment, and brake-shoe replacement.

• PTO and drive coupling: Coupler alignment, pulley alignment, belt and brake service, shaft-bearing repair, and drive-shaft universal-joint replacement.

• Cutting units: Height-of-cut and blade-mismatch adjustment, belt and blade service, spindle and gearbox repair, caster work, and deck removal and mounting.

Written for service technicians, this manual includes tests requiring hydraulic pressure/flow equipment and specialized diesel tools; injection-pump calibration is assigned to a professional diesel service shop.

Engine Repair Scope and Fuel-System Work

Toro expects this manual to be used with the Operator’s Manual and Parts Catalog for the machine’s exact model and serial number.

Ford VSG-411: The 345 chapter covers spark-plug inspection, belt and governor adjustment, crankshaft-pulley installation, and engine removal and installation. It also explains the date-code 2D21 change from four to five main bearings. Internal Ford engine repair requires the separate VSG-411/413 engine manual, which is not included.

Mitsubishi K3D: The 322-D/325-D chapter contains step-by-step procedures for cylinder-head and cylinder-block overhaul. Fuel-system coverage includes glow-plug and compression testing, nozzle and injection-pump tests, injection timing, bleeding, pump and injector service, and engine removal.

External-engine work includes fan-shaft and bearing service, oil-pump inspection and repair, thermostat testing, and water-pump replacement. The water pump’s bearings and seals are not individually serviceable. Injection-pump delivery calibration requires dedicated fixtures and specialist equipment.

Kubota 1105: The 328-D section supplies specifications and refers to the traction-unit engine removal and installation procedure. Internal troubleshooting, testing, disassembly, and assembly require a separate Kubota engine manual; the text identifies the 05 Series manual as Toro P/N 01090SL. The PDF’s external bookmarks also distinguish 05 Series and 05 E2B Series companion manuals by serial number.

Hydraulic Testing and Transmission Overhaul

The hydraulic chapter traces oil flow through the 2WD and 4WD circuits. Drawings include Forward Traction Operation, Raising the Cutting Unit, and Turning Steering Wheel to Right, alongside the hydraulic schematics.

Step-by-step overhaul instructions cover the Sauer-Sundstrand transmission’s pump, center, and motor sections, followed by reassembly and priming. Serial-specific traction-control procedures help match the adjustment method to the machine rather than treating all production builds alike.

Reversing the charge-pump housing can eliminate hydraulic function, while excessive force on the pump shaft can shear the gerotor drive pin.

Electrical Fault Isolation

Separate gasoline and diesel fault charts address starting problems, operating faults, and interlock operation. Wiring sheets distinguish production builds, including a dedicated 328-D schematic.

Later coverage adds charging and glow-system checks, fusible links, diode assemblies, ignition-delay and glow controls, and tests for two-wire and three-wire run solenoids. Electrical service references include a digital multimeter, an inductive ammeter, and Toro Skin-Over Grease P/N 505-47.

Axles, Steering, Brakes, and PTO

The axle chapters extend into differential shafts, bevel-gear cases, ring-and-pinion contact patterns, and clutch service. The Inasaka roller-clutch drive operates in forward travel; the Dae Dong chapter covers a bidirectional clutch and includes the Gear Pattern Movement Summary.

Steering coverage includes valve/pump tests, cylinder leakage testing, and steering-valve overhaul. Exploded views support differential, PTO driveline, steering-valve, and related assembly work.

Mitsubishi injection-pump adjusting plates and cylinder-specific parts must remain indexed and matched to avoid recalibration; misaligned PTO shaft yokes shorten universal-joint life.

Deck Repair and Workshop References

Separate chapters cover the 72-inch cutting units, Triflex 88-inch cutting unit, and Guardian 72-inch Recycler cutting unit. Beyond routine adjustments, they include gearbox overhaul, blade-spindle repair, push-arm and torsion-spring service, and exploded assembly views.

The Triflex chapter adds mechanical-door, skid and roller setup, wing pulley brake, wing-shaft end play, wing lift-cylinder, and wing-stop adjustments.

Reference material includes U.S. and metric torque tables, maintenance charts, capacities, wear limits, electrical test values, and troubleshooting charts. Special-tool references cover compression and nozzle testers, a nozzle adapter, piston-pin and camshaft-bushing tools, hydraulic gauges, and a pressure/flow tester with ORFS adapters.

Before testing or repair, lower and support the cutting unit, relieve hydraulic pressure, isolate the battery as directed, and keep clear of rotating PTO, fan, and blade components. The brake chapter also retains Toro’s asbestos-lining precautions for original brake hardware.

Examples of K3D Valve and Compression Specifications

For the Mitsubishi engine in the 322-D/325-D, the adjustment section specifies cold intake and exhaust valve clearance of 0.25 mm (0.01 in.).

The compression-test reference is 32 kg/cm² (455 psi) at 280 rpm with the engine warm and coolant at 50°C (120°F). Maximum compression difference between cylinders is 2.5 kg/cm² (36 psi).