John Deere 990 Excavator – Technical Service Repair Workshop Manual – TM1230. This is the most complete technical manual available for the John Deere 990 excavator, covering engine systems, hydraulic systems, powertrain components, swing and travel systems, electrical systems, specifications, torque values, and systematic troubleshooting procedures. Includes detailed step-by-step repair instructions, diagnostic procedures, inspection guidelines, hydraulic testing procedures, wiring diagrams, specifications, torque charts, and numerous factory illustrations-exactly as used in authorized John Deere service departments. Unbound, pre-drilled, and ready for a standard 3-ring binder (binder not included) – ideal for heavy equipment repair shops, field service technicians, construction equipment mechanics, fleet maintenance facilities, and advanced owner-operators. Printed in large 8.5″ × 11″ format for superior readability and long-term durability. Professionally printed in high resolution for superior readability. Pre-punched with 3 holes, ready for a standard three-ring binder. Printed on durable paper. Complete manual with 1572 pages. John Deere 990 Excavator. Manual Type: Technical Service Repair Workshop Manual Manual Number: TM1230 Language: English Format: Printed manual, unbound & pre-drilled (binder-ready, binder not included) Page Size: 8.5″ × 11″ Condition: Brand New.