108
Service and Maintenance
Automatic gearbox ZF HP-series
1
C
B
A
2
Changing oil and filter
– Oil and filter should be changed every 30,000 km. Alter-
natively every 90,000 km when using Volvo ”Synthetic
oil”. (See page 111 Oil grades.)
– But at least once a year.
1. Drain off the oil through the drain plug (1) while the gear-
box is warm. Remove the oil filter cap (2) and the filter.
Any oil remaining in the oil cooler does not have to be
drained.
2. Change oil filter, always use a new sealing ring (A) on
the cap. If the oil suction pipe has followed up with the oil
filter from the gearbox casing, it must be refitted with a
new O-ring (C). Make also sure that the upper O-ring (B)
on the oil filter is in place and intact.
Tightening torque for oil filter cap screws: 25 Nm.
3. Fit the drain plugs and tighten them, tightening torque
plug (1) 50 Nm.
4. Fill at least 12 litres of oil in the gearbox when changing
oil. Approx. 20 litres when filling a dry gearbox. The oil
level should remain in the area marked ”stop” on the dip-
stick. This relatively high level is because oil runs from
the torque converter down to the gearbox when the bus
is stationary.
Top up as necessary, start the engine and check the lev-
el according to directions in ”Level control”.
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