Volvo D12, Operator'S Manual

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74 Severe Service Schedule for VHD-Series
General and Check-Chart
Severe Service is defined here for vehicles that typically do maintenance de-
pending on the accumulated engine hours rather than distance travelled. This
includes applications that operate on road surfaces made of concrete, asphalt,
maintained gravel, crushed rock or hard packed dirt or similar surfaces for
90% of the time, and up to 10% of the time in muddy or sandy conditions. (If
more than 10% operation in muddy or sandy conditions, adjust to a more
frequent lubrication schedule.)
Vehicles are equipped with liftable auxiliary axle(s) over 14,000 lb (6 metric
tons) each. Typically, GVWR is over 80,000 lb (36 metric tons) or GCWR is
over 143,000 lb (65 metric tons) or GAWR is over 46,000 lb (21 metric tons).
The service categories show maximum allowable intervals. It is very important
to tailor service to the actual application. For example, if the vehicle is used
off-road, driving through deep, standing water, the lubrication schedule should
be changed to lubricate exposed lubrication points as often as every day.
For example, if the vehicle is used off-road, driving through deep, stand-
ing water, the lubrication schedule should be changed to lubricate
exposed lubrication points as often as every day.
Off-Road Application:
Any vehicle that operates more than 10%
in sandy or muddy conditions.
Heavy Haul Application:
Typical operations include grades of maxi-
mum 12%, moving heavy equipment or
material at legal maximums and special
permit loadings (generally greater than
110,000 lbs [49 metric tons]), high-powered
engines and auxiliary gearboxes are typical,
more than 30 miles between starting and
stopping, may use single retarder.
Vehicle types are: Lowboy, equipment haul-
ing, steel hauler, flatbed trailer hauling.
Heavy Construction Application:
Typical operations include grades over
20%, only use one retarder and a relatively
high number of starts/stops. More than 10%
operation in muddy or sandy conditions, or
more than 20% off paved roads.
Vehicle types are: Concrete mixer/pumper,
flatbed truck, material hauler, dumper, as-
phalt truck, municipal dump, block truck or
crane operation.