Hyundai HL970A Operator's Manual page 245

25) 25) CHANGE THE HYDRAULIC OIL CHANGE THE HYDRAULIC OIL
(1) Lower the bucket on the ground extend the bucket
cylinder to the maximum.
(2) Relieve the pressure in the tank by pushing the
top of the air breather.
(3) Prepare a suitable container.
(4) To drain the oil loosen the drain plug on the rear
frame LH side.
(5) Tighten the drain plug.
(6) Fill proper amount of recommended oil.
(7) Put the breather in the right position.
(8) Start engine and run continually. Release the air
by full stroke of control lever.
※
The oil must be free of bubbles. If bubbles are The oil must be free of bubbles. If bubbles are
present in the oil, air is entering the hydraulic sys- present in the oil, air is entering the hydraulic sys-
tem. Inspect the suction hoses and hose clamps. tem. Inspect the suction hoses and hose clamps.
※
Incase of injecting HBHO (Hyundai Bio Hydraulic Incase of injecting HBHO (Hyundai Bio Hydraulic
Oil) to machines that have formerly used different Oil) to machines that have formerly used different
hydraulic oil, the proportion of residual oil must hydraulic oil, the proportion of residual oil must
not exceed 2 %. not exceed 2 %.
※ ※
Do not mix any other Bio oil, use only HBHO as Do not mix any other Bio oil, use only HBHO as
bio oil. bio oil.
If changing to Bio oil, contact HYUNDAI dealer. If changing to Bio oil, contact HYUNDAI dealer.
26) 26) CLEANING AND REPLACING RETURN FILTER CLEANING AND REPLACING RETURN FILTER
Clean and replace the return filter in the following
manner.
(1)
Remove the cover.
(2)
Remove spring, by-pass valve and return filter
from the tank.
(3)
Replace element with new one and assemble
spring and by-pass valve after cleaning.
(4)
Install the cover on the tank.
·Tightening torque : 6.9±1.4 kgf·m
(50±10 lbf·ft)
6-39
Hydraulic tank
Rear frame
LH side
Drain plug
Cover
O-ring
Spring
Strainer
970A6MI38
Cover
O-ring
Spring
By-pass valve
Return filter
960A6MI24