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Part of the John Deere Repair Manuals.
Fixing a transmission issue on your John Deere LA100 Series tractor? This 324-page John Deere LA110 technical manual PDF (OEM #TM2371) breaks down the complete V-twin engine, hydrostatic transaxle, and steering assembly for the LA100, LA120, LA130, LA140, and LA150 variants. Inside, you get complete main wiring schematics with wire color abbreviations, step-by-step cylinder leakdown test procedures, and a full section of exploded views for the mower deck spindles. Open to the troubleshooting charts to diagnose starting problems or hydrostatic transmission neutral creep before tearing anything apart. Set the spark plug gap to 0.76 mm (0.030 in.) and tighten the carburetor-to-intake manifold bolts to exactly 8 N·m (70 lb-in.) during the engine rebuild. A dead mower cuts no grass. Download this text-searchable file to your phone, jump straight to the repair, and get your machine back on the turf.
What's Inside This John Deere LA100 to LA150 Series Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 3-4 | - |
| Safety | 5-10 | Use Care in Handling and Servicing Batteries, Prevent Battery Explosions, Prevent Acid Burns, Wear Protective Clothing, Parking Safely, Service Machines Safely |
| Specifications and Information | 11-20 | Fastener Torques, Metric Fastener Torque Values, Inch Fastener Torque Values, General Information, Gasoline, Serial Number Locations |
| Engine - Gas | 21-62 | General Specifications, Torque Specifications, Starting Problems, Throttle/Choke Cable Adjustment, Cylinder Leakdown Test, Engine Removal |
| Engine - V-Twin | 63-114 | Engine Specifications, Torque Specifications, Engine Will Not Start, Cylinder Leakdown Test, Engine Removal, Starting Motor Disassembly |
| Electrical | 115-188 | Reading Electrical Schematics, Wire Color Abbreviation Chart, Component Location, Main Wiring Schematic, Cranking Circuit Operation, Armature Air Gap Adjustment |
| Power Train - Gear | 189-218 | General Specifications, Drive Components, Transaxle Operation, Gear Transmission Check, Shift Linkage Adjustment, Transaxle Disassembly |
| Power Train - Hydrostatic | 219-248 | Specifications, Transaxle Components, Hydrostatic System Operation, Hydrostatic Transmission Diagnosis, Neutral Creep Adjustment, Transaxle Removal and Installation |
| Steering | 249-262 | Steering System Components, Steering Shaft and Pedestal Removal and Installation, Steering Sector Gear Removal and Installation, Front Axle Spindle Replacement |
| Brakes | 263-278 | Brake System - Gear Transaxle, Brake System - Hydro Transaxle, Brake Adjustment - Gear, Brake Adjustment - Hydro, Brake Linkage Removal and Installation |
| Attachments | 279-308 | Inch Deck (Engagement, Idlers and Sheaves, Spindle - Cross Section) |
| Miscellaneous | 309-316 | Tire Pressure Adjustment, Front Wheel Removal and Installation, Front Wheel Bushing Removal and Installation, Rear Wheel Removal and Installation, Hood Removal and Installation |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Spark Plug Gap | 0.76 mm (0.030 in.) | p. 23 |
| Spark Plug Torque | 20 N·m (15 lb-ft) | p. 114 |
| Oil Filter Torque | 12 N·m (9 lb-ft) | p. 61 |
| Carburetor to Intake Manifold | 8 N•m (70 lb-in.) | p. 24 |
| Carburetor Bowl Screw | 4.5 N•m (40 lb-in.) | p. 24 |
| Oil Filter Adaptor Screws | 14 N•m (125 lb-in.) | p. 18 |
| Crankcase Oil Capacity | 1.4 L (1.5 qt) | p. 23 |
| Flywheel Bolt | 136 N•m (100 lb-ft) | p. 24 |
| Engine Oil (With Filter) | 1.9 L (2.0 qt) | p. 65 |
| Oil Pump Removal and Installation | This engine is equipped with a full pressure lubrication system with an oil filter. | p. 65 |
| Metric Fastener Torque Value - M8 Steel or Gray Iron | 24 N•m (18 lb-ft) | p. 14 |
John Deere LA100 to LA150 Series Common Problems This Manual Covers
John Deere LA100 Series steering wheel plastic cracks or breaks when used as a step to dismount
Inspect the steering shaft and pedestal per the Steering section (page 249) for stress cracks around the wheel hub. Torque mounting hardware to 24 N·m (18 lb-ft) per the fastener spec. Replace the wheel assembly if cracked; adhesive repairs won't hold since the hub bears operator weight during mount and dismount.
Manual Section: Steering p. 249Drive belt repeatedly jumps off the transmission pulley, especially under load or turning sharply
Check drive belt routing and inspect the belt guides and tensioner pulley for wear or misalignment. On LA130, LA140, and LA150 transaxles, follow the traction drive belt procedure on page 236 and confirm guide brackets are seated correctly; torque the M8 mounting bolts to 24 N·m (18 lb-ft) per the fastener chart.
Manual Section: Power Train - Gear p. 236Starter motor whirs or spins freely but won't engage flywheel to crank the engine
Check the cranking circuit diagnosis chart for wiring and connections. Measure battery voltage (should read 12 VDC) and starting motor draw, which should fall between 90 and 100 amps per the electrical specs on page 120. If the starter spins without engaging, remove it and inspect the 16-tooth drive gear for worn teeth; replace if rounded.
Manual Section: Electrical p. 120Engine fails to start even though the battery is charged and fuel is fresh
Follow the gas engine starting problems chart on page 22 to isolate the fault. Check valve clearance per the specifications on page 23, since factory adjustment often sits out of tolerance. Inspect the carburetor for varnish and torque the carburetor-to-intake-manifold bolts to 8 N·m (70 lb-in.) on reassembly; bleed air from the fuel lines before re-cranking.
Manual Section: Engine - Gas p. 22Flywheel key shears or breaks after the mower blade strikes a rock or hard object
Remove the flywheel per the Engine - Gas removal procedure and inspect the key for shearing or deformation; a sheared key protects the crankshaft from impact damage, so never reuse it. Install a new key, reseat the flywheel, and torque the flywheel bolt to 136 N·m (100 lb-ft) per the spec on page 24.
Manual Section: Engine - Gas p. 24Frequently Asked Questions
How to reset John Deere LA130 blade engagement?
To ensure proper spindle brake engagement, first park the mower on a hard, smooth surface, stop the engine, remove the key, and wait for all moving parts to stop. Then, remove the spark plug wire to prevent accidental starting. The spindle brake engagement should be checked and corrected every time the mower belt tension is adjusted. The brake bracket to nut gap should be 2-3 mm (0.08-0.12 in.). p. 294
Is this John Deere LA100, LA110, LA120, LA130, LA140, LA150, LA100 Series?
Instant PDF download (45 MB). You get the full 324-page searchable Technical Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Are there any print restrictions on this John Deere LA100, LA110, LA120?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
Does this John Deere LA100, LA110, LA120, LA130, LA140, LA150, LA100 Series?
Yes, this John Deere LA100, LA110, LA120, LA130, LA140, LA150, LA100 Series Technical Manual includes a hydraulic system diagram.
