Maintenance Instruction
67
4.6.4 Front Drive Axle Structure and Adjustment (Figure 4-7) (4 Wheel Drive Model)
The power of front drive is transmitted to the front central drive via the transfer case. The power is distributed into the
half-axle on two sides by the front central drive, then transmitted to the final drive to make the driving gear turn.
When working in the field where the conditions are poor, mud and water can easily get in to the front/rear lining,
which will cause end face wear and the axial float to increase. You can adjust the bolt M16 in the front of the front
supporting seat to keep the axial float at normal levels.
Central Drive Adjustment:
There are 2 bearings on the driving gears of the front central drive. After a period of operation, the axial
float increases. Turn the small round nut to reduce the axial float of the bearing. When adjusting, you should have
no load; tighten the small round nut, then reverse (1/25 to 1/15) the circle and lock the small nut. Turn the bevel
gear shaft by hand, which should turn easily.
The gear backlash of conical gear and the meshing mark of the front central drive should have a good contacting
spot along the direction of tooth length (≥50%), along with the direction of the tooth height (≥50%), and a near the
small end. There should also be a clearance of 0.2–0.4 mm. You can create this by by increasing/reducing the
adjusting gasket size. Adjusting method
：
The adjustment method is same as the adjustment of the contact meshing
mark and backlash of the central conical gear of the rear axle. When the engagement clearance between the driving
gear and driven gear of the front central drive increases, you can increase the adjusting gasket on the left of the
differential to return the clearance to normal.
Note
：
The large and small conical gear of the central drive are a matched pair. Do not install seperately.
When replacing, it is better to change both with the bearing; otherwise, that may shorten the drives sevice life.
Final 2 Pairs of Conical Gear Adjustment:
The small gear and bearing of the front final drive is installed on the master pin and the conical gear and the bearing
of the half-axle will get worn over time. This can cause the engagement clearance of the conical gear to increase,
thus, it is necessary to adjust it. To adjust it, unscrew the drain plug under the central drive housing, unclench the
sealing cover on the left/right final drive housing and release the lubricant.
A
．
After the half-axle sleeve separates from the main reducor housing, adjust according to the engagement clearance
of 0.15–0.25 mm. of the gear and contacting spot (along the direction of tooth height (≥50%) and the direction of the
tooth length (≥50%). To reduce the engagement clearance by increasing the gasket size: After adjusting the
engagement clearance and the meshing mark, dismantle the half-axle sleeve and retainer ring for hole in the
