Five Skytrak telescopic material handlers are covered by this 608-page factory service manual, OEM ID 8990405, from the 4266 through the H and L versions of the 4270 and 4290. Nearly a third of this Skytrak 4266, 4270H, 4270L, 4290H, 4290L service manual PDF goes to the hydraulic system: circuit schematics, pressure diagnosis and testing, steer indexing, and pump, valve and cylinder service. Wiring diagrams trace the start, charging and gear selection circuits, while separate chapters handle the Cummins 4BT3.9 engine, the ZF 4 WG-98 TS transmission and the Stabil-TRAK system test. Measure boom wear pads against the 0.625 in (15.9 mm) new thickness, then torque the mounting capscrews to 31 lb/ft (42 Nm). A parked telehandler costs you every hour it waits. Print the chapter you need and take it to the bench where grease on the pages does no harm, and the bookmarked, searchable original stays clean on your shop computer.
What's Inside This Skytrak 4266, 4270 & 4290 Telehandlers Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety Practices | 7-14 | Introduction, Owners/Operators Manual, Safety Information (Safety Alert Symbol, Hazard Statements), Accident Prevention Tag Usage |
| General Information, Specifications and Maintenance | 15-70 | Component Terminology, Introduction (Service Methods, Owners/Operators Manual, Replacement Parts and Warranty Information, Disclaimer) |
| Boom | 71-124 | Boom System Component Terminology, Boom System, Boom Assembly Maintenance, Quick Attach Assembly, Troubleshooting |
| Cab, Covers and Mirrors | 125-166 | Operator’s Cab and Covers Component Terminology, Operator’s Cab, Operator’s Seat and Seat Belt, Controls, Mirrors, Access Panels, Covers and Guards |
| Axles, Wheels and Tires | 167-188 | Axle Assembly Description, Axle Maintenance, Wheel Inspection, Tire Pressure, Wheel Removal |
| Transfer Case and Drive Shafts | 189-204 | Transfer Case Description, Drive Shaft Inspection, Drive Shaft Disassembly, Troubleshooting |
| Transmission: ZF 4 WG-98 TS | 205-222 | Transmission Assembly Component Terminology, Transmission Description, Transmission Operation, Transmission Serial Number, Transmission Specifications, Transmission Maintenance |
| Engine: Cummins 4BT3.9 | 223-264 | Introduction, Safety Information, Engine Serial Number, Specifications and Maintenance Information, Standard Practices, Engine Cooling System, Engine Electrical System, Fuel System |
| Hydraulic System | 265-444 | Hydraulic Component Terminology, Safety Information, Specifications, Hydraulic Fluid, Hoses, Tube Lines, Fittings, Etc. |
| Electrical System | 445-568 | Electrical Component Terminology, Service Warnings, Specifications, Effective Ground Connections, Wiring Harnesses, Fuses and Relays, Electrical System Troubleshooting |
| Stabil-TRAK™ System | 569-598 | Stabil-TRAK Description, Stabil-TRAK Operation, Circuit Operation, System Test |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Retract chain anchor bolt torque | 31 lb/ft (42 Nm) | p. 108 |
| Wear pad mounting capscrew torque | 31 lb/ft (42 Nm) | p. 110 |
| Straight Thread O-ring Fitting (Adjustable) SAE Size 4 | 15-17 lb/ft (20-23 Nm) | p. 19 |
| Straight Thread O-ring Fitting (Adjustable) SAE Size 6 | 34-36 lb/ft (46-49 Nm) | p. 19 |
| Total thickness of a new boom wear pad | 0.625" (15,9 mm) | p. 64 |
| Total wear thickness | 0.25" (6,4 mm) | p. 64 |
| Acceptable boom chain sag | 1.5-2.5" (38-64 mm) | p. 65 |
| Intermediate boom to inner boom measurement | 8.5-9.0" (216-229 mm) | p. 65 |
| Transmission oil cooler back flushing pressure | 165 psi (39.6 bar) | p. 209 |
| Transmission fluid capacity w/ filter change | 3.0 gal (11,3 liters) | p. 208 |
| Hydraulic Pump Flow Rate (4266/4270 models) | 28-32 GPM (1,8-2,0 ltr/sec) | p. 275 |
| Hydraulic Pump Flow Rate (4290 model) | 34-38 GPM (2,0-2,4 ltr/sec) | p. 275 |
Skytrak 4266, 4270 & 4290 Telehandlers Common Problems This Manual Covers
Skytrak 4266 boom with worn wear pads jerky during extend and retract functions
Check the extend/retract and jerky function causes in the boom troubleshooting chart. Measure each wear pad and replace any pad worn to the 3/8" (9,5 mm) limit listed on page 109. Shim front pads to a .07-.13" (1,8-3,3 mm) gap, then torque mounting capscrews to 31 lb/ft (42 Nm) with Loctite 242 blue.
Manual Section: Boom p. 109Boom chain dropping or sagging out of adjustment during extend and retract
Measure boom chain sag and adjust it to 1.5-2.5" (38-64 mm) following page 65. Verify the intermediate boom to inner boom measurement falls within 8.5-9.0" (216-229 mm). Check the retract chain anchor bolts and torque them to 31 lb/ft (42 Nm) per page 108, then run the dropping chain checks in the boom troubleshooting chart.
Manual Section: General Information, Specifications and Maintenance p. 65ZF 4 WG-98 TS transmission shifting problems with low clutch pressure and grinding noise
Check pump flow, pump pressure and clutch pressure against the transmission troubleshooting chart that ends on page 222. Tighten loose housing capscrews to 34 lb/ft (46 Nm), pump mounting capscrews to 85 lb/ft (115 Nm) and valve body capscrews to 7 lb/ft (9,5 Nm). For overheating, back flush the oil cooler at 165 psi (39.6 bar) per page 209.
Manual Section: Transmission Troubleshooting p. 222Axle assembly noisy, leaking oil or running hot with heavy steering effort
Check differential housing oil level; capacity is 9.5 qt (9,0 liters) per page 30. Verify axle support to vehicle frame bolts hold 680 lb/ft (922 Nm) following page 174, and torque wheel lug nuts to 380 lb/ft (519 Nm). Then work through the axle troubleshooting chart for noise, leak, overheating and steering effort causes.
Manual Section: Axles, Wheels and Tires p. 174Hydraulic boom lift and lower circuit problems with low main system relief pressure
Test main system relief pressure and compare the reading to 3,500 ±100 psi (241,5 ±6,9 bar) listed on page 31. Confirm the reading never tops the 3500 psi (241 bar) maximum system operating pressure noted on page 345. Then follow the boom lift/lower steps in the hydraulic circuit troubleshooting section, checking hoses, tube lines and fittings for damage.
Manual Section: Hydraulic System p. 345Stabil-TRAK system letting the machine sway with a spongy ride and indicator light faults
Test the Stabil-TRAK system using the system test procedure in the section starting on page 569 before replacing any parts. Review the circuit operation description so you know what each component should be doing, then work through the troubleshooting tables for swaying, spongy ride and indicator light faults one step at a time.
Manual Section: Stabil-TRAK™ System p. 569Frequently Asked Questions
What are the torque specifications for fasteners on the SkyTrak 4266, 4270, and 4290 models?
For Grade 5 (PC8.8) nuts and bolts, torque values range from 9 lb/ft (12 Nm) for 1/4 inch fasteners to 585 lb/ft (793 Nm) for 1.0 inch fasteners. For metric fasteners, torque ranges from 10 Nm (7 lb/ft) for 6.0 mm to 650 Nm (475 lb/ft) for 24.0 mm. p. 19
What are the replacement specifications for boom wear pads on the Skytrak telehandler?
The total thickness of a new flat wear pad is 0.625 inches (15.9 mm). The angled cut provides a total wear thickness of 0.25 inches (6.4 mm), leaving approximately 0.375 inches (9.5 mm) of unused base material. Pads must be replaced before they are worn past the angled cut indicator. p. 110
What are the replacement specifications for boom chains on the Skytrak telehandler?
Boom chains are constructed of 3/4 inch pitch links with 6 x 6 leaf lacing. You must replace a stretched or damaged chain with a new one, and also replace both clevis' and chain-to-clevis attaching pins with new parts. p. 102
What is the engine oil capacity for the Cummins 4BT3.9 engine in the Skytrak telehandler?
The engine crankcase oil capacity with a filter change is 11.0 quarts (10.4 liters). p. 30
What is the correct torque for the transmission drain plug on the Skytrak telehandler?
When reinstalling the transmission drain plug after service, it should be torqued to 26 lb/ft (35 Nm). p. 54
Will this Skytrak 4266 Service Manual download right away?
Straight to your device: 608 pages of searchable Service Manual, downloadable the moment payment goes through.
Can I print just the pages I need from this Skytrak 4266 manual?
Yes. Print individual pages or full chapters for your own shop use, on letter or A4 paper.
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