An indicator light flickers on mid-shift and nobody on site can tell you what it means. That question is exactly why the Lull 644D-34 operator manual PDF exists: 30 pages of factory operating guidance for this rough terrain forklift, published under OEM ID 68998A. Reading the sample load chart gets its own section, walking you through the vertical and horizontal scales, boom angle arcs, and load areas before you ever pick anything up. Safety fills roughly a third of the book, from ROPS and FOPS to refueling and machine stability, with gauges, indicator lights, steer modes, and joystick controls explained right after. Charge the accumulator to 685 to 715 PSI of nitrogen, and expect 55 to 60 PSI of engine oil pressure at speed. Some days it is just you and the machine, with no one left to ask. Bookmarks and a real text layer put the load chart or lube schedule one click away.
What's Inside This Lull 644D-34 Operator Manual
| System | Pages | Key Topics |
|---|
| Introduction | 4 | Warranty Registration, Pre-Delivery Inspection, Operator Manual, Engine Manual |
| Safety | 5-11 | Safety Standard, Decals, ROPS, FOPS, Refueling Safety, Machine Stability |
| Instruments and Controls | 12-19 | Gauges, Indicator Lights, Ignition Switch, Shift Selector, Steer Mode Selector, Joystick Controls |
| Before Operating the Machine | 20-21 | Equipment Inspection, Work Area Inspection, Work Planning, Protective Clothing, Mount and Dismount Procedures |
| General Operating Procedures | 22-25 | Starting Procedures, Shutdown Procedures, Traveling, Load Lifting, Load Transport, Personnel Lifting |
| Service/Lubrication Schedule Model 644D-34 | 26-27 | System Capacities, Fluid Specifications, Lubrication Schedule, Maintenance Intervals |
| Sample Load Chart | 28-30 | Vertical Scale, Horizontal Scale, Boom Angle Scale, Lettered Arcs, Load Areas, Transaction Area |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| Accumulator Nitrogen Precharge | 685–715 PSI | p. 23 |
| Planetary Hub Capacity (Each) | 34 OZ | p. 27 |
| Tire Pressure | 65 PSI | p. 27 |
| Normal Engine Oil Pressure | 55-60 PSI | p. 12 |
| Normal Operating Voltage | 14.5-15 volts | p. 12 |
| Normal Engine Water Temperature | 180-185 °F | p. 12 |
