6.
7. Let the vibrator head penetrate to the bottom of the layer as quickly as
possible under its own weight.
8. Keep the vibrator head vertical to minimize voids and enhance the release of
entrapped air. For shallow flat slabs, lay the vibrator head horizontally and
drag it through the concrete.
9. Withdraw the vibrator head slowly. Be sure concrete fills in behind leaving
no hole. Do not attempt to “stir” the concrete.
10. Use repeated placements of the vibrator in a systematic pattern to be sure the
entire surface has been vibrated. The area of action can be observed by noting
how far from the vibrator head bubbles appear on the surface. Placements of
the head should insure overlapping of the areas of action.
11. When compacting concrete placed on a previously compacted layer, push the
vibrator 4-6” into the lower layer. Move the vibrator up & down for 5-15
seconds to “knit” the two layers together.
12. Avoid placing the concrete in “heaps”. If it is necessary to flatten a heap,
insert the vibrator head around the perimeter of the heap using as many place-
ments as necessary.
13. Consolidation is complete when no new bubbles come to the top, a glistening
layer of mortar covers the concrete surface, and the “whine” of the motor
indicates that the vibrator speed has leveled
off.
14. Clean all vibrator parts immediately following each use.
IV. Motor Maintenance
Routine monthly maintenance is recommended unless the power unit is used for multiple
shifts per day or in harsh environments (heavy dust, snow, sand, etc.). Refer to the Robin
Engine Owner’s Manual provided with your VMG-1750BP for details on performing engine
maintenance.
1.
Engine Oil
(SAE10W-30, API SJ):
Check before each use. Change after the
first 10 hours of use and every 50 hours there after. Change every 25 hours in
high ambient temperatures.
2. Air Filter:
Check before each use. Clean every 25 hours or more frequently
if used in dusty areas.
3. Spark Plug:
Clean and adjust gap every 25 hours. Replace every two years.
4.
Quick Disconnect:
Require no lubrication and no routine maintenance. To order
additional quick disconnect drive fittings or for other replacement parts, contact your
dealer or Global Manufacturing at 1-800-551-3569.
DO NOT place anything on top of the motor.
DO NOT stand on the backpack frame or engine.
ALWAYS store the unit with its engine upright and the base on a flat level surface.
Do not store the unit on its side. Oil or gasoline may leak as a result. Leaking oil or gaso-
line is toxic and a fire hazard.
For long-term storage, it is recommended that the gasoline tank be drained and the engine
operated until the remaining fuel is consumed.
CAUTION
