Sunex HD 6744 Manuel Du Propriétaire page 3

SETUP
PLEASE REFER TO THE EXPLODED VIEW DRAWING IN THIS MANUAL IN ORDER TO IDENTIFY PARTS.
1. Install the index #9 handle assembly in the index #5 chassis so the holes in the lower portion of the handle line up with the holes
in the chassis. Push the index #13 handle yoke pivot shaft through all the holes and secure the shaft on both ends with the
retaining rings provided.
2. Turn the entire jack on its side in order to hook up the orange and black air hoses that are coming out of the bottom of the index
#9 handle. As you are facing the back of the jack, pull the orange and black hoses back towards you and route them over the
top of the index #13 pivot shaft so that they are in line to engage the connectors in the back of the index #5 tank. Firmly push the
black hose into the index #11 connector labeled black and the orange hose into the index #11 connector labeled red. Pull on both
hoses after they are installed into the connectors to make sure they are firmly seated. Turn the jack upright.
3. Install an air nipple that is suitable for your shop in the index #7 switch assembly. Use pipe dope tape to seal the nipple in the
switch assembly and be careful not to let any excess tape enter the air system. Do not over-tighten the nipple as this could strip
the threads in the switch.
4. Install the index #10 and #19 adaptors in the holder at the base of the index #9 handle assembly.
5. Hook the shop air line quick disconnect onto the nipple.
6. Due to the back pressure release system design of this jack, the jack's hydraulic system very rarely becomes air bound.
Indication of an air bound system is a ram that does not rise smoothly. In some extreme case of an air bound system, air can be
purged by following this procedure:
PURGING AIR FROM THE HYDRAULIC SYSTEM
a. Pump the jack to maximum height by turning the air lever all the way to the right. After maximum
height is reached, turn the air lever to the left to lower the jack all the way down.
b. Repeat step "a" several times until all air is purged from the system.
OPERATING INSTRUCTIONS
This is the safety alert symbol used for the OPERATING INSTRUCTIONS section of this manual to alert you to potential
personal injury hazards. Obey all instructions to avoid possible injury or death.
IMPORTANT: Before attempting to raise any vehicle, check vehicle service manual for recommended lifting points.
1. Become familiar with the identification and function of the operating jack components.
a. The index #26 ram is the shaft that comes out of the jack when you rotate the index #7 switch assembly lever to the right.
Lowering the ram is accomplished by rotating the lever to the left.
b. The index #25 saddle has a hole in it to receive the index #10 or index #19 adaptors. The adaptors can be stacked on top
of each other for additional height. Evaluate the work to be done to determine if there is enough ram stroke to lift the load.
Adding adaptors can bring the jack closer to the load so you can get more effective ram stroke.
2. Chock the vehicle's tires that will not be lifted off the ground prior to lifting the vehicle and if available, apply the emergency brake
or any other method of braking.
3. With the jack in its lowered position and the handle all the way down and locked, push the jack under the vehicle and to its
designated lift point. Lock the handle in a position that will not interfere with the vehicle when raised or lowered. Keep the handle
in that locked position until the work is completed and you are ready to remove the jack from use.
4. In most cases, between 116 and 174 psig input air pressure (do not exceed 200 psig) will lift the maximum capacity load. Rotate
the air lever to the right until the top of the ram comes close to the designated lift point. Make sure the designated lift point is flat,
parallel to the ground and free from grease, any kind of lubricant, and debris. Never get under the vehicle when the jack is being
used. Proceed with pumping the jack in order to lift the vehicle to the desired height. During lifting, inspect the position of the
jack in relation to the ground and the ram in relationship to the load to prevent any unstable conditions from developing. If
conditions look like they are becoming unstable, slowly lower the load and make appropriate setup corrections after the load is
lowered.
5. When the vehicle or load is lifted to its desired height, immediately place jack stands capable of safely supporting the load in
their designated positions and adjust the stands' support columns up as close to the designated vehicle support points as
possible. Although jack stands are individually rated, they are used in a matched pair to support one end of the vehicle only.
Stands are not to be used to simultaneously support both ends or one side of a vehicle. Rotate the air lever to the left to lower the
vehicle onto the jack stands. Make sure the vehicle is safely supported by the jack stands' saddles and not the locating lugs of
the saddles. Inspect the relationship of the jack stands with the ground and the jack stand columns and saddles with the vehicle
to prevent any unstable conditions. If conditions look unstable, rotate the air lever to the right to raise the vehicle off the jack
stands. Make appropriate setup changes and slowly and carefully lower the vehicle onto the jack stands.
6. After the work is done, rotate the air lever to the right until the vehicle is high enough to remove the jack stands from underneath
the vehicle. Rotate the air lever to the left to lower the vehicle to the ground and remove the jack from under the vehicle.
PREVENTATIVE MAINTENANCE
This is the safety alert symbol used for the PREVENTATIVE MAINTENANCE section of this manual to alert you to
potential personal injury hazards. Obey all instructions to avoid possible injury or death.
6744
44 TON TRUCK AXLE JACK
3
MODEL 6744
WITH AIR RETURN
01/08/15