OPERATING THE TRACTOR
llse of Hand .Clutch Lever
The hand clutch lever is provided so that with the driver dismounted
the tractor may be manreuvred when leading, backing up to an implement
or trailer, or when belt tension is being adjusted. To do this, declutch
by the hand lever and engage forward or reverse gear ; the hand
clutch can be re-engaged when standing beside the tractor. Use only bottom
or reverse gear and minimum throttle opening. Do not run the engine
with the clutch disengaged longer than is necessary, but put the gear lever
into neutral if it is desired to keep the engine running.
lJ se of Wheel Equipment
The wheel equipment for use with the " Cropmaster " covers all that
is required in steels and pneumatics, and a wide range of adjustments is
available. No difficulty should therefore be experienced in carrying out
any operation.
Track Adjustme,it
Adjustments to wheel widths are necessary for most field work,
particularly ploughing and row crop cultivations. These are obtained by
utilising the dished centre plate and the offset lugs on the wheel rims as
required; all that is necessary is a jack and two spanners. The centre
plate is cut away between the fixing bolts to enable the lugs in the wheels
to be passed behind the centre plate. A completely illustrated booklet
entitled "Aids to Cropmaster
Farming,"
showing the full range of wheel
settings for all purposes is provided with each Tractor.
.
Special attention is drawn to the changing over of pneumatic tyres
to ensure correct direction of rotation. When it is necessary to reverse
· the wheels to obtain a particular track setting they should be transferred
to opposite sides of the tractor. Correct rotation should be checked by
referring to the arrow moulded into the side wall of the tyre.
lJse of· Ballast
Wheel slip is expensive, not only because of wear but also because it
wastes fuel. To reduce wheel slip to a minimum the operator should first
select the type of wheel best suited to the conditions and then consider
the use of ballast in the form of wheel we�ghts. and, in the case of pneumatic
equipment, water-filling of the tyres. If water ballasting is required it is
advisable to consult an Authorised David Brown Dealer, who will have
the necessary equipment for this job.
The following recommended quantities of water and calcium chloride,
per tyre, should be adhered to in order to protect the tyre down to 0
°
F.
T
yr
e size,
9·00-28 . .
15 gallons water plus
26
pounds calcium
chloride dissolved in 3 gallons, water.
Tyre size,
ll ·00-28
20
gallons ·water plus 42 pounds calcium
chloride dissolved in 8 gallons water.
T
yr
e size, ll
·25-28
23 gallons water plus 50 pounds calcium
chloride dissolved in 10 gallons water.
The amount of calcium chloride given is for the flaked type ; if
crystalline calcium chloride has to be used the weight per tyre should be
doubled.
PAGE 16
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