JAC Trucks. Service manual — part 86

Venting of the brake hydraulic loop
If air gets into the brake hydraulic loop, the braking effect will go down. So,
venting must be done if the fluid level is found very low in the brake fluid reser鄄
voir or the hydraulic loop is disassembled during the brake maintenance. Vent鄄
ing shall be done by two persons together.

Vent the air in the following steps
1. Truly release the parking brake.
2. Start and keep the engine in running until the vacuum degree goes up ade鄄
quately.
If venting is done with the engine not running, adverse impact will occur to the
vacuum booster.
3. Check the level in the brake fluid reservoir, and add some more if needed.
Vent the brake hydraulic loop in the following steps.
Rear right wheel要要

要rear left wheel要要

要front right wheel要要

要front left wheel.

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4. Take off the rubber housing from the venting screw and clean it. Connect the
ethylene hose to the venting screw, and put the other end of the hose into a
transparent vessel.

5. Repeatedly step on the brake, and keep it stepped on.
6. Loosen the venting screw, and discharge the brake fluid with bubbles togeth鄄
er into a vessel, and tighten the venting screw at once.

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7. Slowly release the brake pedal, and do it repeatedly until bubbles disappear
in the brake fluid pumped into the vessel. During the venting, keep the brake
fluid in the brake fluid reservoir at the specified level. Put the housing back in
position after venting is over.

8. After venting is finished for all the wheels, check the level in the brake fluid
reservoir, and add some more if necessary.

Parking brake adjustment
It is normal that the parking brake handle travels up to 5 -8 notches if it is
pulled with a force of 30kg. The parking brake can be adjusted in the following
ways:

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1. With the front wheels fixed, release the parking brake.
2. Jack up the rear wheels off the ground completely; pull the gearshift lever
back to the neutral. Turn the propeller shaft to align the adjusting hole in the
brake drum with the pinion. The adjuster is located below the center line of the
propeller shaft.

3. Insert a screw driver into the adjusting hole in the brake drum; turn the pinion
upward until it can be turned no more.
4. Turn the pinion back from the above position by 25 notches, and then check
the travel of the parking brake handle.

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If the parking brake handle still travels more than the standard value, then use
the adjusting nuts to adjust the length of the parking brake cable.
(1) Loosen the locknut.
(2) Use adjusting nut and adjusting bolt to adjust the length of the parking brake
cable.
(3) Tighten the adjusting nut, and lock it with locknut.
Tire replacement in rotation
In order to keep an even abrasion degree of all the wheel tires and to prolong
their service life, the front and rear tires should be exchanged in their positions
in the order shown in the figure.
Exchange the tires every 9000km.

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Inflation pressure of tires
The standard inflation pressure for the tires: 670kPa
The tire pressure check and their maintenance should be done at the time
when they are in cold state (over 3 hours parking or less than 1.6km running).
It is mandatory to keep a tire inflation pressure value up to the requirement.
For the trucks with dual wheels as the two-tire rear wheels, it will suffice to use
general inflating valve spanner to help measure the air pressure of the tires on
the inner side.

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Plug-in fuse

Starter

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Insert type fuse
If the head lights or other elements cannot work but the fuse is OK, then you
should check the insert type fuse. If it is already melt broken, change for a new
one. A JAC insert type fuse must be used for the change.
No steel wire is allowed to be used, even if it is temporary use. It will bring
about great damage or even fire.

License light
Screw off the fixing bolts before taking down the glass.

OWNER爷S MANUAL

JAC High end Light Trucks

Fuse in-place tag

Roof light and interior mirror
The lampshade can be simply taken out by hand, and then take down the bulb.

Fuse box
The fuse box is located under glove compartment. Open the fuse box and you
can check and replace the fuse. The box cover can be pulled out by hand.
Please use a pair of nipper pliers to change the fuse.

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