Four machines share one factory source here: the 293-page Kubota Workshop Manual (OEM #97897-15140) documents the T1570, T1670, T1770, and T1870 riding mowers from engine internals to mower deck. Wiring diagrams cover both electrical variants, including the Kubota Reverse Awareness (KRA) system, and the hydrostatic transaxle gets full disassembly sequences for the T1670 through T1870. Troubleshooting runs 26 pages across engine, brakes, steering, PTO, and lift systems. Torque values sit in every section: 48.1-55.9 N·m on the engine pulley mounting screw, for one. Note the spark plug gap split, 1.02 mm on the T1570/T1670 against 0.75 mm on the T1770/T1870. When your machine is down, guessing burns hours. Open the bookmarked PDF on any device and search any spec by keyword.
What's Inside This Kubota T1570–T1870 Series Manual
| System | Pages | Key Topics |
|---|---|---|
| G General | 12-48 | Features, Identification, Handling Precautions for Electrical Parts and Wiring, Fuel and Lubricants, Special Tools |
| 1 Engine 1 | 49-102 | Separating Engine, Engine Body, Fuel System, Troubleshooting, Servicing Specifications |
| 2 Engine 2 | 103-152 | Separating Engine, Engine Body, Fuel System, Troubleshooting, Servicing Specifications |
| 3 Hydrostatic Transaxle | 153-175 | Checking Hydrostatic Transaxle, Checking and Adjusting, Disassembling and Assembling, Troubleshooting, Servicing Specifications |
| 4 Brakes | 176-183 | Checking and Adjusting, Disassembling and Assembling, Troubleshooting, Servicing Specifications |
| 5 Front Axle | 184-190 | Checking and Adjusting, Disassembling and Assembling, Troubleshooting, Servicing Specifications |
| 6 Steering | 191-198 | Checking, Servicing, Disassembling and Assembling, Troubleshooting, Servicing Specifications |
| 7 Fender and Lift System | 199-209 | Separating Fender, Lift Linkage, Checking and Adjusting, Troubleshooting, Servicing Specifications |
| 8 PTO System | 210-217 | Checking and Adjusting, Disassembling and Assembling, Troubleshooting, Servicing Specifications |
| 9 Electrical System 1 | 218-247 | Wiring Diagram, Kra (Kubota Reverse Awareness) System, Battery, Starting System, Charging System, Ignition System |
| 10 Electrical System 2 | 248-278 | Wiring Diagram, Kra (Kubota Reverse Awareness) System, Battery, Starting System, Charging System, Ignition System |
| 11 Mower | 279-293 | Checking and Adjusting, Disassembling and Assembling, Troubleshooting, Servicing Specifications |
Every system also includes tightening torques.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Muffler cover mounting screw torque | 23.5 to 27.5 N·m (2.4 to 2.8 kgf·m, 17.4 to 20.3 ft-lbs) | p. 59 |
| Front bumper mounting screw torque | 23.5 to 27.5 N·m (2.4 to 2.8 kgf·m, 17.4 to 20.3 ft-lbs) | p. 59 |
| Brake Disk to Brake Pad Clearance | 0.76 mm | p. 178 |
| Front Wheel Alignment Toe-in | 0 to 10 mm | p. 186 |
| T1570, T1670 | ||
| Engine 1 Spark Plug Gap | 1.02 mm | p. 58 |
| Engine Oil Capacity (Crankcase) | 1.9 L | p. 29 |
| Fuel Tank Capacity | 11.0 L | p. 9 |
| Cylinder Head Surface Flatness (Engine 1) | 0.076 mm | p. 55 |
| T1770, T1870 | ||
| Engine 2 Spark Plug Gap | 0.75 mm | p. 109 |
| Engine Oil Capacity (Crankcase) | 1.7 L | p. 29 |
| Fuel Tank Capacity | 15.0 L | p. 9 |
| Cylinder Head Surface Flatness (Engine 2) | 0 to 0.08 mm | p. 109 |
Kubota T1570–T1870 Series Common Problems This Manual Covers
Kubota T1570 engine cranks but won't fire, no spark at plug in cold weather
Remove the spark plug and inspect the electrode; gap must be 1.02 mm (page 58). A fouled or cracked plug is the first cause to eliminate on a cold no-start. Check the air filter: clean it every 25 hours, replace every 100 hours (page 18). Verify fuel reaches the carburetor by cracking the bowl drain, and confirm the seat safety switch closes completely when you sit down.
Manual Section: Engine 1 TroubleshootingMachine jerks violently when moving from a stop, hesitates in both directions
Check the HST drive belt for glazing, cracking, or slipping off its pulleys. Belt tension is a scheduled 50-hour service item (page 18); a slack belt is the most common cause of surging at initial movement. Verify the PTO tension spring free length at 69 to 72 mm (page 212). If transaxle fluid looks dark or smells burnt, drain and refill before attempting any adjustment.
Manual Section: Hydrostatic Transaxle TroubleshootingPTO lever engaged and deck spinning freely, blades won't rotate under load
Measure the PTO tension spring free length: it must be 69 to 72 mm (page 212). A stretched spring cannot hold belt pressure through the clutch under load. Inspect the mower belt for glazing or slipping off the idler pulley. Check cable travel through its full throw and verify the PTO clutch lever mounting torque at 23.5 to 27.5 N·m (page 213). Belt tension checks are due every 50 hours (page 18).
Manual Section: PTO System TroubleshootingBattery fully charged overnight but engine clicks and won't crank in the morning
Test regulated output voltage at the battery terminals; it should read at least 12.5 V DC (page 231). A battery that reads OK unloaded but collapses under starter draw points to a dead cell or failed stator. Inspect the starter B-terminal connection and torque it to 9.8 to 13.7 N·m (page 225). Battery condition checks are due every 100 hours (page 18). Confirm the seat switch and KRA interlock circuits are closed before condemning the starter.
Manual Section: Electrical System 1 TroubleshootingDeck leaves uncut strips of grass and shakes badly at mowing speed
Torque the blade screws to 102.9 to 117.6 N·m (page 283). A loose blade is the single most common source of deck vibration and missed strips. While the deck is off, check the tension pulley nut at 49.9 to 54.2 N·m (page 283) and inspect the belt for glazing or fraying. Clear any packed debris from around the blade spindles and discharge chute, then verify the deck sits level side-to-side.
Manual Section: Mower TroubleshootingFrequently Asked Questions
What are the recommended service intervals?
The maintenance checklist sets service intervals by component. The air cleaner (T1570-T1670) gets cleaned every 25 hours and replaced every 100 hours; engine oil changes every 100 hours; the spark plug gets checked every 100 hours.
What fluids and capacities does this machine require?
Fuel is unleaded gasoline, 87 octane or higher: 11 L (2.9 U.S. gals.) on the T1570/T1670 and 15 L (3.9 U.S. gals.) on the T1770/T1870. The engine crankcase takes 1.9 L (2.0 U.S.qts.) of API SG, SH, SJ or higher oil (SAE 5W-20 or 5W-30 above 0°C). For the hydrostatic transmission, use 2.3 L (2.4 U.S.qts.) of API SH, SJ or SD oil (SAE 20W-50).
How to troubleshoot engine won't start?
Probable causes for a no-crank engine: a loose engine mounting nut, a discharged battery, a starter fault, or a defective main switch. Fixes range from retightening the mounting nuts to checking battery specific gravity and charging it (G-28), or repairing/replacing the starter (9-S9 to 9-S12) or main switch (9-S8).
What are the hydraulic system specifications?
A variable pump moves up to 10 cc (0.011 U.S.qts., 0.009 Imp.qts.) per revolution, paired with a fixed-displacement motor at 21 cc (0.022 U.S.qts., 0.018 Imp.qts.) per revolution. Transmission fluid capacity is 2.3 L (2.4 U.S.qts.) on the T1570 and 3.6 L (3.8 U.S.qts.) on the T1670, T1770, and T1870.
What format is this Kubota T1570–T1870 Series manual in?
This is a 293-page searchable PDF ready for immediate download. It works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Are there any print restrictions on this Kubota T1570–T1870 Series manual?
Yes. The PDF carries no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Does this Kubota T1570–T1870 Series manual include hydraulic schematics?
Full hydraulic system diagrams are included, covering circuits, valve locations, and hydraulic component specs for the Kubota T1570–T1870 Series.
Document Quality
This is a native digital PDF, allowing you to search and copy the full text content. All text is consistently crisp and highly readable throughout the document. Diagrams and illustrations are sharp at any zoom level, with clear and legible labels. The pages are clean, free from scan artifacts, stains, or skewed content. There are numerous blank pages acting as section dividers.
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