JLG X23J - X700AJ Service Manual - Manual (Page 45)

SECTION 3 - CHASSIS & TURNTABLE
3-18 – JLG Lift – 3121448
8. Rotate the gearbox housing, so that the plug (1) is
on the top of the cover.
9. Unscrew the two plugs (1-2) and fill from the upper
hole until the oil flows out from the hole (2).
10. Tighten the oil plugs (1-2) and let the gearbox run.
After a few minutes, stop and check the oil level.If
necessary, refill.
Approximate oil capacity = 0,5 liters ±10%
Figure 3-28.
CHARACTERISTICS OF THE HYDRAULIC SYS-
TEM
The oil in the hydraulic system (which also lubricates the
hydraulic motor) must reflect the ISO VG 46 char-
acteristics. It must be filtered with a maximum grade of 10
μm and with a level of contamination equal to or inferior to
class 9 according to NAS 1638 or 18/15 as stated in ISO/
DIS 4406.
It is advised not to mix together oils with different prop-
erties.
It is advised to use a filter with a led indicator that can be
seen externally, with a flow control valve that blocks the
flow of oil when the filter is clogged.
If it is necessary to work in low temperatures (artic cli-
mates) it is essential to use specific guidelines (contact
the manufacturer).
Checking the temperature of the hydraulic oil is one of the
most critical aspects of the hydraulic system.
High operational temperatures will cause a degradation of
the oxidation resistance level and will accelerate the dete-
rioration process of the hydraulic oil.
Therefore fl is important to follow the measures below.
- The temperature of the hydraulic oil during working con-
ditions should remain between 30°C and 60°C.
- The temperature of oil should reach 20°C prior to start
operation.
- During operation the oil temperature can rise to 90°C but
this temperature is acceptable only for very short periods
of time.
These temperatures have been set to take into consider-
ation general degrading in viscosity as well as the wear
respiting additives used in the oil.
The life of the motor will be shortened considerably if the
operating temperature is constantly at a level that is hash
er than 60°C.