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Part of the John Deere Repair Manuals.
Looking for the John Deere LTR155, LTR166, LTR180 Technical Manual PDF? These 436 pages (OEM TM1768) cover all three lawn tractors, including their Kohler, Briggs & Stratton, and Kawasaki engines. You get a full electrical section with wiring diagrams and theory of operation for every circuit: power, cranking, charging, headlights. Inside: engine troubleshooting for each of the three powerplants, hydrostatic transaxle and traction drive procedures, steering gear removal, and mower deck service down to the blade timing belt. Gap the spark plug at 1.015 mm and torque it to 20 N-m (180 lb-in.); the battery takes 1.9 L of electrolyte fill. No more chasing a no-crank condition with forum guesses. Bookmarked with a full text layer; search any spec by keyword, pull it up on your phone in the shop, and start wrenching.
What's Inside This John Deere LTR155, LTR166, LTR180 Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 3 | Table of Contents, General Diagnostic Information, Electrical Wiring Harness Legend, Component Location, System Schematic |
| Safety | 4-8 | Safety Signs and Labels, Safe Operating Practices, Servicing Safety, Fuel Handling Safety |
| Specifications and Information | 9-21 | General Vehicle Specifications, Torque Specifications, Fuel and Oil Specifications, Lubricant Specifications, Product Identification Locations |
| Engine - Kohler | 22-70 | Fuel System, Carburetor, Governor, Cylinder Head, Piston & Crankshaft, Oil Pump, Balancer Shaft, Ignition |
| Engine - Briggs & Stratton | 71-120 | Fuel System, Carburetor, Governor, Cylinder Head, Piston & Crankshaft, Oil Pump, Flywheel, Ignition |
| Engine - Kawasaki | 121-174 | Fuel System, Carburetor, Governor, Cylinder Head, Piston & Crankshaft, Oil Pump, Balancer, Ignition |
| Electrical | 175-344 | Theory of Operation, Diagnostic Information, Power Circuit Operation, Cranking Circuit Operation, Charging & Shunt Circuit Operation, Headlight Circuit Operation |
| Power Train - Hydrostatic | 345-374 | Drive Components, Traction Drive Belt, Transaxle, Forward & Reverse Pedals, Freewheel System, Brake System |
| Steering | 375-382 | Steering Gear Assembly Removal and Installation, Front Axle Removal and Installation, Steering Specifications, Torque Specifications, Component Location |
| Attachments | 383-420 | Mower Deck, Grass Collector, Mower Deck Lift Linkage, Mower Blade Timing Belt, Blade Brake, Mower Drive Belt |
| Miscellaneous | 421-428 | Front Wheel, Rear Wheel, Fuel Tank, Hood, Seat and Support |
| Index | 429-436 | Alphabetical Index |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Electrolyte required fill | 1.9 L | p. 11 |
| Spark Plug Gap | 1.015 mm (0.040 in.) | p. 73 |
| Spark Plug Torque | 20 N•m (180 lb-in.) | p. 74 |
| Battery Reserve @ 25 amp | 90 minutes | p. 123 |
| Distance Between Plastic Caps of Compression Spring (Belt Tensioner Assembly) | 32 – 34 mm (1.26 – 1.34 in.) | p. 347 |
| Brake Lever Travel (Maximum) | 30° | p. 347 |
| Brake Capacity | 351.5 N•m (259 lb-ft) with 11.3 N•m (100 lb-in.) on brake arm | p. 347 |
| Compression Spring | 32 – 34 mm (1.26 – 1.34 in.) | p. 360 |
| Drive Belt Idler Nuts | 30 N•m (22 lb-ft) | p. 385 |
| Blade Bolt Torque | 57 N•m (42 lb-ft) | p. 385 |
| Mower Blade Mounting Bolt | 57 N•m (42 lb-ft) | p. 385 |
| Kohler Engine Crankcase Capacity (With Filter) | 1.8 L | p. 11 |
John Deere LTR155, LTR166, LTR180 Common Problems This Manual Covers
Briggs and Stratton engine surges and hesitates at full throttle, especially in wet heavy grass
Clean the air filter and blow chaff out of the cooling fins before blaming the carburetor. Verify fast idle at 3350 ± 50 rpm against the spec on page 73, then pull the plug and reset the gap to 1.015 mm (0.040 in.). Drain stale fuel and refill the 6.0 L tank with fresh gas if surging continues.
Manual Section: Engine - Briggs & Stratton p. 71Traction drive belt slips, forward pedal feels jerky and tractor crawls on slight grades
Measure the distance between the plastic caps on the tensioner compression spring and adjust to 32 to 34 mm (1.26 to 1.34 in.) as shown on page 347. Inspect the traction drive belt for glazing, set idler sheave belt guide clearance to 3 mm (0.125 in.) per page 365, and torque the idler nut to 26 N•m (228 lb-in.).
Manual Section: Power Train - Hydrostatic p. 347Frequently Asked Questions
What are the torque specifications for the engine crankshaft bolt on the John Deere LTR180?
The flywheel cap screw on the Kawasaki engine (LTR180) must be tightened to 56 N•m (41 lb-ft). p. 125
How do you fix John Deere LTR155 starter clicks once but engine will not crank or turn over?
Check battery terminals for corrosion and tighten both cable clamps before condemning the starter. Test the seat, brake, and PTO interlock switches through the electrical diagnostics starting on page 175. If the battery fails a load test, fill the replacement with 1.9 L of electrolyte and charge it fully before installing. p. 175
How do you fix mower deck belt keeps slipping off after a few minutes, blades stop or pulsate under load?
Remove the deck and inspect the mower drive belt for glazing and missing cogs. Spin each spindle by hand; a rough or seized spindle throws the belt every time. Check the brake pad to spindle sheave gap of 1.5 to 2.0 mm on page 401, then torque the drive belt idler nuts to 30 N•m (22 lb-ft). p. 385
How do you fix cut looks uneven and stepped, one side scalps while the other leaves tall stripes?
Set tire pressures first: 83 kPa front and 55 kPa rear with the mower installed. Level the deck to a side-to-side difference of 3.0 mm maximum using the procedure on page 398, then set rear blade tips 6 to 9 mm higher than the front. Replace bent blades and torque blade bolts to 57 N•m (42 lb-ft). p. 398
How will I receive this John Deere LTR155, LTR166, LTR180 Technical Manual?
This is a 436-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Can I print this John Deere LTR155, LTR166, LTR180 manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Does this John Deere LTR155, LTR166, LTR180 manual have electrical diagrams?
Yes, an electrical wiring diagram is included to help trace the main circuits.
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