Allied Skid-Pac 1000, Safety, Operation, Maintenance And Parts, Page: 21 / 44

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TM103349_SP1000B_15sep 11
8.0 Operation – [cont'd]
6. Maintain down pressure as the material
compacts. For larger areas, decrease boom
down-force and slide the compactor over the
material with a repetitive, back and forth motion.
The initial pass is continued until compaction is
no longer apparent, typically 5 to 15 seconds.
Run the compactor until maximum density is
achieved but avoid unnecessary run time that
can lead to loosening the soil previously
compacted.
7. Repeat compacted lifts as necessary until a
finished surface is achieved. Optimum
compaction is usually obtained with two passes.
The duration of the initial pass is dependent on
depth and material. The second pass may
require additional fill material and Skid-Pac
repositioning to achieve finished grade.
8. After compaction is complete, re-position the
Skid-Pac and/or carrier to continue working.
NOTE:
Factors that adversely affect the longevity of
the spring include abrasions, over-stretching and
prolonged operating cycles that build-up heat in the
rubber. Stopping the Skid-Pac during repositioning
can help minimize the rubber from heat-aging.
The rate of compaction to a 95% Modified Proctor will
vary due to many factors, including variations in
operator technique. Other factors that will produce
different results include -

Soil densities are reduced at the bottom of
excessively high lifts. It may be necessary to try
different lifts to determine the maximum and most
effective lift that can be used and still achieve the
required density.

Compaction is affected by material type. Soils
with 50% or more granular content are the most
responsive to compaction through vibratory
action.

Moisture content is also critical to achieving
maximum compacted densities of fill material. Fill
materials may need conditioning prior to
compaction.
IMPORTANT
Always practice proper operating techniques.

Do not allow mounting frame to contact base
plate. Spring mount and frame damage may
result. The spring mounts can be stretched to
approximately one-half (1/2) their width.

Do not use the Skid-Pac to lift or push
materials. Damage to spring mounts and other
components may result.

Do not operate the Skid-Pac underwater.
Bearing damage may result.

Do not operate the Skid-Pac without the
compaction plate attached. A dynamic
imbalance may result in equipment damage.

At temperatures below 32
o
F (0
o
C), operate the
Skid-Pac for a few minutes without down force
to allow the spring mounts to warm.

Do not operate Skid-Pac with hydraulic oil
temperature above 180
o
F (80
o
C)
The Allied Skid-Pac combines three actions that are
highly effective in the compaction of granular type
soils:
1. Vibration – The vibratory action is generated by
the hydraulic motor that drives the out-of-balance
eccentric mass turning at a high rpm. Granular
soils are extremely responsive to consolidation
by vibration. Soil particles are set in motion and
settle under their own weight. The air surrounding
these particles is forced out, which allows them to
pack closely together.
2. Impulse Force - The centrifugal force generated
by the rotating eccentric mass. When properly
controlled, this also gives an impact force.
3. Down Force – A pressing force exerted by the
carrier against the Skid-Pac springs.
8.3 Compaction Handbook
Further information is available in the “Compaction
Handbook”. To request a copy, contact your local
dealer or Allied’s Customer Service. Ask for part
number 103392.