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When using the jack place pads under the truck wheels. Be sure to apply the
parking brake and to engage the lower gear in the gearbox.
For lifting the front axle, set the jack screw head in the recess on the clip
fastening the spring; for lifting the rear or intermediate axle set it under the spring
support bracket.
When the jack is out of operation the head screw should be turned in, the
working and delivery plungers lowered and the shut-off needle screwed out.
If oil seeps through plungers or shut-off needle, tighten collar nuts, and
eliminate oil leaks through joints of casing parts by tightening the casing head.
Do not raise the working plungers by hand when the shut-off needle is
screwed home; otherwise air can enter the jack working chamber.
If the jack fails to ensure the plunger’s full working stroke, check the oil
level. Add oil up to the filler closed with plug 4 after lowering the jack plungers
completely and the jack standing upright. See the jack mechanism on Fig. 128.
If the jack fails to operate due to dirt accumulated on parts of the working
chamber, drain soiled oil through the filler, fill kerosene and pump the jack
through after screwing out the shut-off needle.Then, on draining the kerosene,
fill filtered oil,
ВМГЗ
grade. The jack may be filled with
МКЕ
-10A oil.
Fig. 128. Jack:
1-base; 2-gasket; 3-cylinder of outer working plunger; 4-cylinder pipe; 5,6-outer and
inner working plungers; 7-screw; 8-seal; 9–case head; 10-packing ring; 11-plunger
head; 12-plug; 13-pump level; 14-shut-off needle
