jcb VMT160, Operator'S Manual

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Introduction
Machine Description
3 3
9811/6650-7
Machine Description
The JCB Vibromax Vibratory Tandem
Drum Roller
The JCB Vibromax VMT machine is a self-propelled,
vibratory tandem drum rollers which is powered by a 3
cylinder, diesel engine.
The machine is designed for compacting soil types ranging
from stones to silty sand, or asphalt construction materials
when rolling over the subgrade in a forward or reverse
direction (with or without vibration).
Four scrapers (two on each drum) are mounted on the
machine and sprinkler bars are fitted to the front and rear
drums. The spray nozzles and the bar end caps are
removable for easy cleaning.
The hydrostatic drive system allows for infinitely variable
travel speeds. The drive motors (one motor mounted on
the left side of each drum) are connected in series on the
VMT160 and parallel on the VMT260. The machines is
always driven with all drum drive. Each motor incorporates
a spring on, pressure off brake system which engages
when the machine is in neutral. The drive motor hoses are
protected inside steel frame plates.
A hydraulic system is also used to turn the machine front
and rear vibratory shafts. Designed with an overturning
weight system on the vibratory shafts, the machine has
selectable front drum, rear drum or both drums vibration.
The machine operates at a vibratory frequency of between
50 and 66 Hz and a nominal amplitude of 0.5 mm.
The machine has an articulated steering system giving a
tight turning radius.
Intended Use
The machine is intended only for compacting beds of earth
or bituminous construction when running over the
subgrade in the forward or reverse direction, with or
without vibration.
These building materials include soil types ranging from
stones to silty sand and having water contents ranging
from 40% to 110% of the optimum water content. These
figures are in accordance to the standard Proctor test DIN
18127.
Fine-grained soils or soils having higher water contents
require a qualified trial compaction.
The machine is intended to be used only on a subgrade
gradient up to the permissible gradient.
K Use of Machines on Gradients or Slopes ( T 51)
K Performance Dimensions ( T 140)
K Definition of Gradeability ( T 51)
K Operating the Sprinklers and Scrapers ( T 55)
K Using the Scrapers ( T 135)
K Operating in Dusty or Sandy Areas ( T 56)
The machine is not intended for use in any other way.
Use for which it is not intended includes, in particular:
– It is not permissible to drive on a gradient which is
greater than the permissible gradient of the machine
during operation.
Before driving on a gradient, it is still necessary to
check, at the start of the gradient as seen in the
intended driving direction, whether there is adequate
frictional engagement between the wheels and the
drum and the roadway, i.e. whether, on the gradient,
the