AIRTUG EL3-s Montage- und Betriebsanleitung - Seite 5

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Airtug® / 1350 Chester Industrial Parkway, Avon OH 44011 / 216-941-9781 / www.airtug.com

Winch Operation:

1. Ensure the strap is always over the top of the winch wheel.

If you notice it on the bottom - pull the strap all the way out

and wind it back in so the strap is positioned over the top

of the winch wheel.

2. When loading an aircraft, press the lock lever towards the

handle and frame to the down position and pull the strap

out towards the front of the tug. You should hear the winch

clicking throughout this action.

3. Bring the winch lever to the neutral position which will

leave the strap loose or otherwise unlocked.

4. Connect the strut strap around the nose gear or the "J"

hook (if purchased as an option) - connect to the hook at

the end of the strap. Position the winch lever to the straight

up position (locked) and load the aircraft onto the tug by

cranking the winch handle clockwise. You are now ready to

move the aircraft.

Wet Battery Maintenance: (If you purchased gel cell batteries, there is no battery maintenance

required.)

1. New batteries (wet or gel cell) require a full charge before use and need to be cycled several times before

reaching full capacity.

2. Battery connections should be kept tight at all times. Periodic inspection is recommended.

3. Vent caps should remain in place and tight at all times during operation and charging.

4. Keep batteries clean from all dirt and corrosion.

5. A maintenance routine should be set up to check the battery ﬂuid level every two (2) weeks initially until an

adequate routine is established for the particular operating environment. The acid level should be 1/4"

above the battery cell plates. The acid level should never touch the ﬁll well. Distilled or treated water should

be used to replenish the batteries. Care should be taken to avoid metallic contamination (iron).

6. Batteries should not be discharged to the point of no longer being able to power the tug. Keeping the

batteries fully charged will greatly reduce the risk of a dead battery when you need it most.

7. Batteries should be brought up to a full charge at the earliest opportunity using the built in 24V battery

charger with reverse polarity protection and ﬂoat mode. The battery charger should be left on when the tug

is parked to maintain proper charging and maintenance of batteries at all times. Keeping the batteries fully

charged will reduce the risk of freezing in cold temperatures.

8. Avoid charging the batteries when the ambient temperature exceeds 120

9. As batteries age, the maintenance requirements increase. Maintain the water level. Older batteries will take

longer to fully charge.

10. Periodic battery testing is an important preventative maintenance procedure. Hydrometer readings of each

cell while fully charged gives an indication of balance and the true charge level. Imbalance could mean the

need for equalizing, and is also a sign of potentially improper charging or a bad cell. Voltage tests (open

circuit, charged or discharged) can identify a bad or weak battery. Load testing will identify a bad battery

when other methods fail. A weak battery will cause premature failure of a companion battery.

11. Extreme temperatures can substantially affect battery performance and charging. Cold temperatures

reduce battery capacity and retard charging. Heat increases water usage resulting in overcharging.

EL3-S & EL3-H Assembly & Operating Instructions / 7-17-17