Part of the John Deere Repair Manuals.
All 581 pages of this John Deere AMT600, AMT622, and AMT626 Technical Manual (OEM #TM1363) zero in on your 1991 Material Transporter: power train teardowns, electrical diagnosis, steering and brake service, and full hydraulic procedures. Inside: wiring schematics for the starting and charging systems, plus hydraulic schematics with complete circuit routing for the lift and drive assemblies. You get a dense troubleshooting section with model-specific diagnostic paths for each variant, backed by exploded views and step-by-step rebuild procedures for the transaxle, drive axles, and pulley assemblies. Confirm brake pedal freeplay at 18–22 mm (0.70–0.87 in.); the AMT600 engine rates at 6.3 kW (8.5 hp) versus 7.5 kW (10 hp) on the AMT622/626. Your machine is down. Keyword search and bookmarked sections get you to the right spec without digging through 581 pages cold.
What's Inside This John Deere AMT600–AMT626 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 9-52 | Safety, General Specifications, Repair Specifications, Fuels and Lubricants, Serial Number Locations, Features and Attachments |
| Engine Repair | 53-64 | Remove and Install Engine |
| Fuel System Repair | 65-74 | Fuel Pump, Fuel Tank, Fuel Filter |
| Electrical Repair | 75-98 | Starting System, Charging System, Lighting and Controls, Battery Cable and Wiring Harness |
| Power Train Repair | 99-166 | Drive Belt, Drive Chains and Sprockets, Drive Pulley, Driven Pulley, Transaxle, Drive Axles |
| Steering and Brake Repair | 167-192 | Front Wheel Bearings, Steering Yoke, And Fork, Steering Quadrant, AMT622/626, Brakes |
| Miscellaneous Repair | 193-212 | Seat, Shroud, And Fenders, AMT600, AMT622/626 |
| Test & Adjustment Specifications/Operational Checkout Procedure | 213-228 | Test and Adjustment Specifications, Operational Checkout Procedure, AMT600, AMT622/626 |
| Engine Operation, Tests & Adjustments, AMT600 | 229-284 | Component Location, Theory of Operation, Diagnosis, Tests & Adjustments |
| Engine Operation, Tests & Adjustments, AMT622/626 | 285-345 | Component Location, Theory of Operation, Diagnosis, Tests & Adjustments |
| Electrical Operation, Tests & Adjustments | 346-447 | Component Location, Theory of Operation, Diagnosis, Tests & Adjustments, Wiring Schematics |
| Power Train Operation, Tests & Adjustments | 448-505 | Component Location, Theory of Operation, Diagnosis, Tests & Adjustments |
| Steering & Brakes Operation, Tests & Adjustments, AMT600 | 506-527 | Component Location, Theory of Operation, Diagnosis, Tests & Adjustments |
| Steering & Brakes Operation, Tests & Adjustments, AMT622/626 | 528-549 | Component Location, Theory of Operation, Diagnosis, Tests & Adjustments |
| Hydraulic Operation, Tests & Adjustments | 550-579 | Component Location, Theory of Operation, Diagnosis, Tests & Adjustments, Hydraulic Schematic |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Safety sign replacement | Replace missing or damaged safety signs. | p. 11 |
| Brake Pedal or Lever Freeplay | 18—22 mm (0.70—0.87 in.) | p. 29 |
| Fuel Tank Capacity | 18 L (4.75 gal) | p. 23 |
| Transaxle Oil Volume | 2.3 L (2.5 qt) | p. 23 |
| Drive Belt Minimum Width | 27 mm (1-1/16 in.) | p. 27 |
| Drive Belt Deflection | 38—42 mm at 45 N (1.50—1.75 in. at 10 lb) | p. 27 |
| Wheel Lug Nuts Torque | 100 N·m (75 lb-ft) | p. 29 |
| Spark Plug Gap | 0.64 mm (0.025 in.) | p. 30 |
| AMT600 | ||
| Engine Horsepower | 6.3 kW (8.5 hp) | p. 23 |
| Engine Crankcase Oil Capacity | 1.2 L (1.3 qt) | p. 23 |
| AMT622, AMT626 | ||
| Engine Horsepower | 7.5 kW (10 hp) | p. 24 |
| Engine Crankcase Oil Capacity | 1.1 L (1.2 qt) | p. 24 |
John Deere AMT600–AMT626 Common Problems This Manual Covers
John Deere AMT600 engine cranks but will not start or runs rough when hot p. 215
Check cylinder compression as detailed on page 215. Remove the spark plug and connect a gauge. Crank the engine repeatedly. Verify the reading meets the minimum requirement of 620 kPa (90 psi). If compression is low, inspect the valves and piston rings.
Manual Section: Engine Diagnosis, Tests & Adjustments—AMT600Premature drive belt wear and jerky aggressive engagement when accelerating from a complete stop p. 27
Inspect the drive belt for glazing or missing cogs. Measure the drive belt minimum width. Replace the belt if it wears below 27 mm (1-1/16 in.) as noted on page 27. Verify that belt deflection is 38-42 mm at 45 N (1.50-1.75 in. at 10 lb).
Manual Section: Power Train Diagnosis, Tests & AdjustmentsBrake effort is excessive or parking brake lock fails to hold the machine securely p. 29
Inspect the brake cables and caliper assemblies. Measure and adjust the linkage until brake pedal freeplay is between 18-22 mm (0.70-0.87 in.). Reinstall the wheels and torque the wheel lug nuts to exactly 100 N·m (75 lb-ft) as outlined on page 29.
Manual Section: Steering & Brakes Diagnosis, Tests & Adjustments—AMT600Engine loses power, backfires through the carburetor, and uses too much oil during operation p. 30
Remove and inspect the spark plugs. Measure the spark plug gap using a feeler gauge. Adjust the gap to exactly 0.64 mm (0.025 in.) as shown on page 30. Check the engine crankcase and ensure the oil capacity is exactly 1.1 L (1.2 qt).
Manual Section: Engine Diagnosis, Tests & Adjustments—AMT622/626Frequently Asked Questions
What are the torque specifications for steering gear and rear axle on John Deere AMT series?
For the rear axle, the Axle Bearing Retainer Nuts Torque is 25 N·m (18 lb-in) and the Wheel Lug Nuts Torque is 100 N·m (75 lb-ft). For steering components, the Axle Cap Screw Torque and Yoke Cap Screw Torque are both 41 N·m (30 lb-ft), while the Fork Pivot Cap Screw Torque is 125 N·m (92 lb-ft).
What are the replacement specifications for Safety signs and warning labels (missing or damaged)?
Replacement safety signs and warning labels should be obtained from your John Deere dealer. It is important to ensure new equipment components and repair parts include the current safety signs, and to refer to the machine operator's manual for correct placement.
How do you fix john Deere AMT600 engine cranks but will not start or runs rough when hot?
Check cylinder compression as detailed on page 215. Remove the spark plug and connect a gauge. Crank the engine repeatedly. Verify the reading meets the minimum requirement of 620 kPa (90 psi). If compression is low, inspect the valves and piston rings.
How do you fix premature drive belt wear and jerky aggressive engagement when accelerating from a complete stop?
Inspect the drive belt for glazing or missing cogs. Measure the drive belt minimum width. Replace the belt if it wears below 27 mm (1-1/16 in.) as noted on page 27. Verify that belt deflection is 38-42 mm at 45 N (1.50-1.75 in. at 10 lb).
How will I receive this John Deere AMT600, AMT622, AMT626 Technical Manual?
A 581-page Technical Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Can I print specific sections of this John Deere AMT600, AMT622, AMT626 manual?
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.
Can I find wiring schematics in this John Deere AMT600, AMT622, AMT626 manual?
Yes, this John Deere AMT600, AMT622, AMT626 Technical Manual includes a wiring diagram for the electrical system.
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