Second-class maintenance
The second -class maintenance in鄄
cludes checking, adjustment, and
lubricating. Besides items in first -
class maintenance, the following
things should be done in second -
class maintenance.
1. Check the engine cylinder for
pressure, sweep out the remainder of
combustion chamber. Then measure
the wear degree of cylinder.
2. Check air gates for seal, adjust
the clearance of them. Then do re鄄
pairing, grinding, or adjusting.
3. Replace engine oil, oil filter ele鄄
ment, and seal ring, clean the lubri鄄
cation system of the engine.
4. Check and adjust the advance
angle of injection. Check the injector
for pressure and atomization. Wash
the fuel tank.
5. Check the thermostat before
check the water drain on water
pump.
6. Check the breather pipe on
crankshaft case for damage and fix.
7. Check the engine and starter if
they work normally. Especially check
the brush and commutator for wear.
8. Check and adjust the release
clearance of clutch.
9. Adjust the clearance between
brake pad and brake (parking &
running brake).
10. Tighten the transmission bearing
cap. Check transmission for correct
shift. Check and lubricate the tro鄄
chometer flexible shaft.
11. After clean the transmission, rear
axle, and steering gear, replace oil.
12. Check the frame for crack. Check
bolts for loose. Check parts of cab
and body for desquamation, and if
all parts are fixed well.
13. After jack up vehicle so that all
wheels move away from ground, start
the engine and keep it running until
felt hot. Then run it faster and slower
discontinuously and listen carefully
on the other hand to detect abnormal
sound. Check the drive system and
wheels for shake. Also check the
other parts for loose and abnormal
sound.
Seasonal maintenance
In order to keep some parts meet the
requirements of climate on aspects
56
HFC1020
series trucks
of technique and work request, do
seasonal maintenance.
At the beginning of summer:
1. Cleanout water scale in the
coolant system.
2. Replace lubrication for summer.
3. Fueling with #0 diesel oil specified
in GB252.
4. Clean up the battery and adjust
the specific gravity of electrolyte.
At the beginning of winter:
1. Clean up the battery and adjust
the specific gravity of electrolyte.
Then remove and charge it.
2. Install cold proofing devices, also
skid preventation devices if neces鄄
sary.
3. Fueling with #10 diesel oil speci鄄
fied in GB252.
Notice during runningin pe鄄
riod
To improve vehicle's reliability and
economical efficiency and also to
use it longer, follow these during run鄄
ning-in period which is specified as
2000~2500km.
Before running-in period
1. Wash vehicle with water, and
check all bolts and nuts for tighten.
2. Check the radiator for enough wa鄄
ter, and check the engine, transmis鄄
sion, rear axle, and steering gear
box for enough lubrication, also
check battery and reservoir for liquid
level. Check all tube conjunctions for
leak.
3. Check the start system, drive sys鄄
tem, and steering system for correct
operation.
4. Check electrical equipments and
lamp instruments for correct opera鄄
tion, and check brake system for
normal air pressure.
5. Check the shift gears for right; the
control parts for normality, transmis鄄
sion for shifting smoothly, and the in鄄
dicator should works correctly.
6. Check tires for proper air pres鄄
sure.
7. Check that if driver tools and ac鄄
cessories are taken.
During the running-in period
1. The new truck should run on
smooth road, and don't make it load
more than 50% of its rated load be鄄
fore it traveled 800km and don't load
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