Timberjack 762B Index:

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1
762 B Harvester head . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2
Main components of head . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2
2 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
2.1 Warranty service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
3 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1
Warning symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1
Meaning of warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
Before starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3
During service and maintenance . . . . . . . . . . . . . . . . . . . 3–3
Working with oils. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–5
Planning your work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–1
Thinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–3
Final felling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–4
5 Planning your work . . . . . . . . . . . . . . . . . . . . . . . . . . 5–1
Thinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–3
Final felling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–4
Working technique for final felling . . . . . . . . . . . . . . . . . . . . . 5–5
Felling into trees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–5
Felling away from trees . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–6
Two–directional felling . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–7
Working technique for thinning . . . . . . . . . . . . . . . . . . . . . . . . 5–8
Thinning with a harvester alone . . . . . . . . . . . . . . . . . . . . 5–8
Thinning with a harvester and chain saw . . . . . . . . . . . . 5–9
Thinning between tracks . . . . . . . . . . . . . . . . . . . . . . . . . . 5–10
Felling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–11
When felling on sloping ground . . . . . . . . . . . . . . . . . . . . . . . 5–13
Felling trees with large roots . . . . . . . . . . . . . . . . . . . . . . . 5–14
Limbing, crosscutting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–15
Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–16
Felling/Crosscutting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–16
Limbing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–17
Feeding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–18
6 Service and maintenance . . . . . . . . . . . . . . . . . . . . . 6–1
Daily maintenance (Max. 12 hours.) . . . . . . . . . . . . . . . . . . . 6–1
Tightening torques for bolt fastenings . . . . . . . . . . . . . . . . . . 6–2
Chain sawcare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–3
0–2 1/96–04
Page
0001
Edition no. Serial no.
Service manual Timberjack 762B
Feed equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–4
Saw equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–5
Sprocket, guide bar and chain . . . . . . . . . . . . . . . . . . . . . . . . 6–7
Changing the sprocket . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–7
Changing the guide bar and chain . . . . . . . . . . . . . . . . . . 6–7
Stretching the chain by hand . . . . . . . . . . . . . . . . . . . . . . 6–8
Shortening a saw chain . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–9
Checking and replacement of chain idler . . . . . . . . . . . . 6–10
Grinding the limbing knives . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–11
Diameter measuring equipment . . . . . . . . . . . . . . . . . 6–12
Checking the diameter potentiometer, Dapt . . . . . . . . . . . . . 6–12
Checking the diameter potentiometer, Lokomatic . . . . . . . . 6–12
Checking the diameter potentiometer, 3000 . . . . . . . . . . . . 6–13
Fine adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–14
Dismantling the diameter sensor . . . . . . . . . . . . . . . . . . . . . . 6–14
Mounting the diameter sensor . . . . . . . . . . . . . . . . . . . . . . . . 6–14
Length measuring equipment . . . . . . . . . . . . . . . . . . . 6–15
Setting the guide bar and sensor . . . . . . . . . . . . . . . . 6–16
7 Hydraulic components on
harvester head . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–1
Connecting block, saw motor . . . . . . . . . . . . . . . . . . . . . . . . . 7–2
Hydraulic components on valve block . . . . . . . . . . . . . . . . . . 7–3
List of items, hydraulic circuit 762B . . . . . . . . . . . . . . . . . . . . 7–4
Checking and setting the pressure
for Timberjack 3000 . . . . . . . . . . . . . . . . . . . . . . 7–6
Setting the main pressure
limiting valve 52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–6
Checking the setting of the main pressure
limiting valve 52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–7
Check/set pressure reducing valve 55, servo pressure
forward/reverse feed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–7
Check/set pressure reducing valve 18 for guide
bar return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–8
Check/set pressure reducing valve for high pressure
limbing tool, lower limbing tool (27), upper
limbing tool (45) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–8
Check/set pressure limiting valve for low pressure
limbing tool, lower limbing tool 26, upper limbing tool 44 7–9
Check/set pressure limiting valve 36, feed roller
high–pressure grip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–10
Check/set pressure limiting valve 35, feed roller
low–pressure grip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–10

Check/set pressure reducing valve 14, tilt up . . . . . . . . . . . 7–11
Pressure setting, automatic chain tightening device . . . . . . 7–12
Checking and setting the pressure
for Dapt/Lokomatic . . . . . . . . . . . . . . . . . . . . . . . 7–13
Setting the main pressure limiting
valve 52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–13
Checking the setting of the main pressure limiting valve 52 7–13
Check/set pressure reducing valve 55, servo pressure
forward/reverse feed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–14
Check/set pressure reducing valve 18 for guide bar
return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–14
Check/set pressure reducing valve for high pressure
limbing tool, lower limbing tool 27, upper limbing tool 45 7–15
Check/set pressure limiting valve for low pressure limbing
tool, lower limbing tool 26, upper limbing tool 44 . . . . . 7–15
Check/set pressure limiting valve 35, feed roller
low–pressure grip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–16
Check/set pressure limiting valve 36, feed roller
high–pressure grip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–16
Check/set pressure reducing valve 14, tilt up . . . . . . . . . . . 7–17
8 Electrical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–1
Electric circuit Dapt 517, Lokomatic . . . . . . . . . . . . . 8–2
Electric circuit Dapt 513, Lokomatic, Attachment . 8–4
Electrical connections Timberjack 3000 Attachment . . . . . 8–6
Electrical connections Timberjack 3000 1270 . . . . . . . . . . . 8–7
Technical data Timberjack 762 B . . . . . . . . . . . . . . . . . . . . . . 11–1
20 Optional equipment . . . . . . . . . . . . . . . . . . . . . . . . . 20–1
Automatic chain stretcher . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20–1
Stretching the chain by hand . . . . . . . . . . . . . . . . . . . . . . . . . 20–2
Dye marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20–3
Dye quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20–3
Filling with dye . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20–3
Prior to operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20–3
Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20–3
When not in use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20–4