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 |
