Operating techniques
86 Operating on inclines
Operating on inclines
Uphill operation
The automatic transmission normally makes sure that the
correct rimpull is provided on uphill grades.
Under certain conditions, the transmission may start "gear
hunting". This means that the transmission changes up and down
between two gears at short intervals.
Gear-shift hunting depends on the available power not being sufficient to
operate in the higher gear, but is enough for upshifting from the lower gear.
It is possible to prevent gear-shift hunting in two ways:
1 Select the next lower gear.
or
2 Activate the gear-shift inhibitor with the switch on the control
panel.
Always engage the longitudinal differential lock / 6-wheel drive when
operating in difficult terrain, see page 66.
Downhill operation
To avoid unnecessary stress to the transmission, the following
operating instructions should be followed:
– Rule: Select the same gear for operating downhill as you would
for operating up the same hill.
If you do not follow this rule, you may loose control of the
machine.
– Lower the speed before the downhill.
– Plan downhill operation so that in the first instance the retarder
pedal is used, in order not to overuse the service brakes on the
machine.
WARNING!
Q Do not permit engine speeds above 2300 rpm (38 r/s)
when operating downhill.
Q When operating down a steep incline with a full load, it
may happen that the exhaust brake and the engine
braking function together do not provide sufficient
retardation and this leads to an increasing travelling
speed. If this happens, also the service brakes must be
used.
Q The machine must not be allowed to roll with the gear
lever in neutral.
A Retarder pedal
1
4
1044777
1
1
2
2
3
4
5
6
6
A25E
4
2
7
4
9
6
11
7
18
11
24
15
35
22
44
27
50
31
A25E
Max. permitted speed when operating downhill
1044778
1
1
2
2
3
4
5
6
6
A30E
4
2
6
4
9
6
11
7
17
10
23
14
34
21
44
27
50
31
A30E
Max. permitted speed when operating downhill
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