Name: Lull 644B, 844C, 1044C, 6K, 8K, 10K Service Manual with Wiring Diagrams
Author: Lull

A boom that drifts under load or a frame that won't hold level often traces back to a valve or cylinder nobody can pin down without factory data. That data sits in this 636-page Lull 644B service manual PDF (OEM ID 10709790), which covers six forklift variants across the 644B, 844C, 1044C and K-series family. Hydraulic schematics for the control manifold and mid-inlet systems trace flow through the pump unloader valve, rear oscillation lock and boom extend lockout circuits, with ZF DW-2 and DW-3 harness diagrams right behind them. Boom and transfer work takes up the biggest share of the book, from shimming to full teardown of 2, 3 and 4-section booms. Transmission control pressure should read 230 to 260 psi on your gauge, and the return filter flange nuts take 35 ft-lbs. One missing torque value can park a machine all day. Bookmarked and text-searchable, your copy pairs exploded views with each rebuild so you order the right component the first time.

What's Inside This Lull 644B, 844C, 1044C Manual

System	Pages	Key Topics
Safety	27-38	General (Caution, Warning, And Danger, Safety Standard), Maintenance Safety, Decals and Placards
Identification and Specifications	39-66	Serial Number Locations, Engine Specifications
General Maintenance	67-87	Service Preparation Procedures, Service and Repair Procedures, Replacement Parts (General), Lubrication (General), Torque Specifications
Reference Diagrams	88-140	Schematic, Model 644B W/ Naturally Aspirated Engine, Control Manifold Hydraulic System, Mid-Inlet Hydraulic System
Supply, Pressure, and Return Hydraulics	141-240	Hydraulic Reservoir, Hydraulic Pump, Multi-Spool Control Valve, Hydraulic Control Manifold, Pump Unloader Valve
Boom and Transfer	241-310	Boom and Transfer Hydraulics, Joystick Controls (Removal, Installation, Disassembly), Hydraulic Cylinders (Description, Checking Cylinder Condition), Joystick Controls, Hydraulic Cylinders, Boom Hoist Cylinder, Carriage Tilt Cylinder, Selector Valve
Section Boom	311-339	Shimming Procedures, Inspection Procedures, Extension Cylinder
Section Boom	340-395	Shimming Procedures, Inspection Procedures, Extension Cylinder
Section Boom	396-463	Shimming Procedures, Inspection Procedures, Boom Removal, Boom Disassembly, Extension Cylinder
Extension Proximity Switch and Transfer Carriage	464-498	Transfer Carriage, Boom Cradle, Transfer Cylinder
Frame Tilt and Oscillation	499-547	Frame Tilt System, Frame Tilt Control Valve, Frame Tilt Cylinder, Frame Level Indicator, Rear Oscillation Lock System, Rear Oscillation Lock Cylinder, Oscillation Control Block, Frame Tilt Lockout Valve
Transmission	548-572	ZF Transmission, Dw-2 Shifter, Dw-3 Shifter, Troubleshooting, Electrical System
Brakes	573-616	Service Brakes, Service Brake Pedal and Valve, Accumulator, Park Brake
Outriggers	617-636	Outrigger Cylinders, Differential Pressure Switch, Boom Extension Proximity Switch, Outrigger Control Valves

Quick Reference Specifications

Specification	Value	Page
General Torque for Standard Bolts (SAE Grade 2, 8-32)	14 in-lbs	p. 79
Transmission control pressure	230–260 psi (16–18 bar)	p. 553
Compensator Valve Cartridge (CS Port) Torque	65 ft-lbs.	p. 219
Suction tube elbow torque	250–283 ft-lbs	p. 165
Hydraulic suction hose capscrews torque	55 ft-lbs	p. 165
Joystick connector torque	25–29 ft-lbs	p. 254
Joystick capscrew torque	50 in-lbs	p. 254
Torque swivel nuts on hoses	50–58 ft-lbs	p. 435
Torque swivel nuts on hydraulic tubes	50–58 ft-lbs	p. 435
Transmission valve solenoid resistance	24–40 W	p. 552
Frame Tilt Angle	12.5° Right and Left	p. 45
Hydraulic Reservoir Capacity	44 Gallons	p. 45

Brand	Lull
Model	644B, 6K, 844C, 8K, 1044C, 10K
Machine Type	Forklift
Manual Type	Service Manual
Language	English
Format	Searchable PDF (Digital Download)
Pages	636
File Size	32 MB
Manual No.	10709790
Wiring Diagrams	Yes
Hydraulic Schematics	Yes
Torque Specifications	Yes
Bookmarked / Indexed	Yes

Lull 644B, 844C, 1044C, 6K, 8K, 10K Service Manual with Wiring Diagrams

What's Inside This Lull 644B, 844C, 1044C Manual

Quick Reference Specifications

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