Grizzly DEEP DIGGER Manual page 23

10 Operating Instructions
Before you use the Deep Digger for the
first time.
Your Deep Digger is a robust machine, none-
the-less the initial preparation of the machine
for work and the "running in" period will be
of critical importance to the service of the
machine.
1. Securely tighten all nuts and bolts.
2. Check tyre pressures (see table on this
page).
3. Check placement of shear pins so that
break points (grooves on the shear pin)
are positioned between the tine and tine
locating plates so that correct operation is
possible.
4. Check hydraulic system for leaks - SEE
WARNING. Folding Deep Diggers are
fitted with rephasing cylinders. It is
necessary to bleed the system of air.
This is done by holding the tractor control
lever fully open for at least 2 minutes.This
should be done as required.
5. Grease all nipples.
WARNING!
Under no circumstances should a body
part be used to find hydraulic leaks.
High pressure injection of fluid can
cause serious injury and likely death.
TIP: use a sheet of paper.
December 2019
WARNING!
Do not exceed 30 km/hr when
towing the machine. The maximum
permissible speed is 30 km/hr. If
this speed is exceeded, the tyre
manufacturer will not warrant any
damage to tyres.
10:4 Ripping Techniques
10:4:1 Operating Depth
This will depend upon the task to be
performed, and the operating conditions.
10:4:2 Hard Pan Removal
Strictly speaking, establishing the exact
nature of a hard pan is performed with a
soil penetrometer which gives resistance
pressures at various soil depths.
Conversely it is possible to identify different
bands of soil by investigating the soil profile.
The hard pan layer is generally found
between 4 to 10 inches below the ground
surface,although this will vary with soil types,
as will the degree of compaction.
10:4:3 Operating Speeds
The optimum speed for the machine will be
determined by the conditions and the task
being performed.
Specifications are subject to change without prior notification
A suggested operating speed of 3-5 mph (4.8-
8 kph) is advised. Faster speeds will result in
excessive draught and increased wear and
tear on both tractor and Deep Digger.
Operating speeds in drier conditions will need
to be reduced as premature wear of ground
engaging parts will result.
Operating too fast in dry conditons may result
in large clods coming to the surface. If clods
remain a problem with slow speeds it may
be necessary to delay the operation until
more moisture is available, or fit the optional
crumble roller.
10:4:4 Turning at the End of a
Run
It is important that the Deep Digger is always
raised from the ground when turning to avoid
unnecessary stress on the tractor and Deep
Digger frame. Warranty does not apply for
damage caused by turning in the ground.
10:4:5 Ideal Moisture Conditons
The Deep Digger is designed to lift and break
or shatter hard layers of sub-soil. If the soil
is too dry or too wet, the process of breaking
and shattering hard soil pans is impeded.
As a reference or guide to soil moisture for
breaking hard pans; the most optimum soil
moisture for ripping is typically present at the
end of Spring when grasses mature and start
to dry off.
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