11-8
Part names and
inspection items
Nominal
dimensions
Standard value for
reassembly
Usable
limits
Service instructions
and remarks
6) SLOW RETURN CHECK VALVE(Flow control valve)
Maximum
pressure
280 ㎏f/㎠(3982 psi) Gear oil
SAE #80 ∼ #90
at a temperature of 50 ±
5℃
(122 ±41 F)
Cylinder port
leaks
1 ㏄/min.at a pressure of 90 ㎏f/㎠
7) MAIN CONTROL VALVE
Cylinder port
leaks
5 ㏄/min or less under a pressure of 100 ㎏f/㎠ Gear oil
SAE #80 ∼ #90 at a
temperature of 50 ±
5℃
Clearance
between main
spool and casing
0.01 ㎜
8) MAIN RELIEF VALVE
Cracking pressure 145 ±5 ㎏f/㎠
9) MAIN GEAR PUMP
Delivery (ℓ/min) Front :40(ℓ/min)
Rear : 16(ℓ/min)
Efficiency of 91 % at 2200
rpm
10) SUCTION FILTER
Rated flow 43 ℓ/min
Filtration density 150 mesh
Filtration area 6231 ㎠
1 ¼ - 12 UNF
11) LINE FILTER
Rated flow
35
Filtration density
100 mesh