This Walker Illustrated Parts Manual covers the Model MDD (20.9 HP Kubota D722 diesel) and Model MDG (24.5 HP Kubota WG750 gasoline) commercial rider mowers, serial numbers 97-29676 and on. Its 67 pages break the machine down into illustrated assemblies with the part numbers you need to order the right component.Sections cover decals, body and chassis assemblies, the full range of tractor components, special options, and maintenance. You can look up power transmission belts and pulleys, the engine group, air intake and exhaust, radiator, hydrostatic ground drive, and the electrical assemblies.Owners, dealers, and independent shops use it to identify worn parts by exploded diagram, confirm quantities, and cross-reference the Kubota air and fuel filter numbers before placing an order.
What's Inside This Walker MDD, MDG Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Decals | 3-4 | Tractor Decals, Walker Product Decals, Danger Decals Warning Decals Caution Decals, Maintenance Decals, Option Decals |
| Body / Chassis Assemblies | 5-10 | Body / Chassis Assembly (GHS Models), Rear Body Assembly (GHS Models), Body Assembly (SD Models) |
| Tractor Components | 11-48 | Main Component Power Transmission (GHS Models, SD Models), Engine Group (MDD Models, MDG Models), Air Intake & Exhaust Group, Radiator Group, Hydrostatic Ground Drive Assemblies |
| Special Options | 49-60 | Light Kit, Armrest Kit & Walker Touch-Up Paint, Power Dump Kit (Bushel GHS Models Only), Power Deck Lift Kit, Tail Wheel Lock Kit |
| Maintenance | 61-64 | Lubrication Points, Ignition Switch Circuits, Relay-A Fuel Solenoid Start Relay, Relay-B Warning Relay, Relay-C Fuel Solenoid Run Relay, Fan Speed Control, Relay-A Start Relay |
| Operator's Notes | 65 | - |
| Warranty | 66-67 | Limited Warranty For Walker Commercial Rider Mower, What This Warranty Covers, And For How Long, What This Warranty Does Not Cover, How To Obtain Service Under This Warranty |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Ground Drive Belt, Micro-V replacement | 1 required | p. 11 |
| Blower Belt (3VX280) replacement | 1 required | p. 31 |
| Hydrostatic Drive, CCW (700-032) replacement | 1 required | p. 23 |
| Hydrostatic Drive, CW (700-031) replacement | 1 required | p. 23 |
| O-Ring Seal replacement | 2 required | p. 23 |
| Hydrostatic Drive lubrication type | Oil (refer to Owner's Manual for procedure) | p. 61 |
| Clutch Idler Pulley replacement | 1 required | p. 11 |
| Idler Pulley (3") replacement | 2 required | p. 11 |
| Blade Drive Gearbox lubrication | Oil (2 places, permanently lubricated and sealed) | p. 61 |
| Tee Gearbox, Deck lubrication | Oil (1 place, permanently lubricated and sealed) | p. 61 |
| Air Cleaner replacement | 1 required | p. 19 |
| Air Filter Element (70000-11221 Kubota) replacement | 1 required | p. 19 |
Walker MDD, MDG Common Problems This Manual Covers
Hydrostatic drive loss or weak drive
A Walker rider that loses drive or moves unevenly usually needs the hydrostatic units checked first, since worn pumps, tired seals, or contaminated fluid are frequent causes. The Tractor Components section illustrates the Hydrostatic Ground Drive Assemblies so you can order the correct hydro unit and O-ring seals.
Manual Section: Tractor Components p. 11Deck belt slip and poor cutting
Belts and pulley surfaces get contaminated with oil, causing slip and weak blade performance. The Tractor Components section shows the ground drive belt, blower belt, and the idler and drive pulleys with their part numbers for replacement.
Manual Section: Tractor Components p. 11Blade drive gearbox leak
The blade drive and tee gearboxes are permanently lubricated and sealed, so a leak or low level can be hard to spot until failure. The Maintenance section identifies the lubrication points to inspect on a regular schedule.
Manual Section: Maintenance p. 61Worn spindle bearings and pulleys
Spindle bearings and deck hardware are common wear items that produce vibration and noise as hours build up. The Tractor Components section lays out the pulleys, idlers, and related drive parts so you can match the failed component exactly.
Manual Section: Tractor Components p. 11Starting relay or fuel solenoid fault
A no-start or intermittent shutdown can come from the start relay, fuel solenoid relays, or warning relay circuits. The Maintenance section documents the ignition switch circuits and relay layout for both MDD and MDG models.
Manual Section: Maintenance p. 61Clogged air or fuel filter
Rough running or lost power under load often traces to a dirty air filter or restricted fuel filter rather than an electronic fault. The Tractor Components section lists the Kubota air cleaner element and the correct fuel filter numbers for each model.
Manual Section: Tractor Components p. 11Frequently Asked Questions
Which Walker models does this parts manual cover?
It covers the Walker Model MDD, the 20.9 HP Kubota D722 diesel, and the Model MDG, the 24.5 HP Kubota WG750 gasoline commercial rider mowers, from serial number 97-29676 and on.
Does it show actual Walker part numbers?
Yes. It is an illustrated parts catalog, so each assembly is shown as an exploded diagram with item numbers, part numbers, and quantities required. The Tractor Components section covers the engine, drive, and deck hardware you order most. p. 11
Can I find the hydrostatic drive parts in it?
Yes. The Tractor Components section includes the Hydrostatic Ground Drive Assemblies, with the CW and CCW hydro units and their O-ring seals shown by part number so you order the correct side. p. 11
Does it include wiring schematics?
Yes. The Maintenance section contains wiring schematics for both MDD and MDG models along with the ignition switch circuits and relay identification, which helps when tracing electrical faults. p. 61
How will I receive this Walker MDD, MDG Parts Catalog?
A 67-page Parts Catalog in searchable PDF, available the moment checkout completes. View it on computer, tablet, or phone, with no shipping wait.
Am I able to print pages from this Walker MDD, MDG manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Does this Walker MDD, MDG Parts Catalog have electrical diagrams?
Yes, this Walker MDD, MDG Parts Catalog includes complete electrical wiring diagrams, wire routing, and connector pinouts.
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