Service instructions
and remarks
Usable limitsStandard value
for reassembly
Nominal
dimensions
Part names and
inspection items
6) SLOW RETURN CHECK VALVE(Flow control valve)
1 ㏄/min.at a pressure of 90 ㎏f/㎠Cylinder port leaks
Gear oil
SAE #80 ～ #90
at a temperature of 50
± 5℃
280 ㎏f/㎠Maximum pressure
7) MAIN CONTROL VALVE
5 ㏄/min or less under a pressure of 100 ㎏f/㎠
0.01 ㎜Clearance between
main spool and
casing
Gear oil
SAE #80 ～ #90 at a
temperature of 50 ± 5℃
Cylinder port leaks
8) MAIN RELIEF VALVE
145 ±5 ㎏f/㎠T290/T300/T330/
2810NEW
9) MAIN GEAR PUMP
Efficiency of 92 % at
2600 rpm
21.5 ℓ/minT290/T300/T330/
2810NEW
10) SUCTION FILTER
45 ℓ/minRated flow
150 meshFiltration density
790㎠Filtration area
11) LINE FILTER
80 meshFiltration density
32 ℓ/minRated flow
31 ㎠Filtration Area
11-8
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