New Holland L180 Repair Manual page 47

DISTRIBUTION SYSTEMS ­ PRIMARY HYDRAULIC POWER SYSTEM
6. Visible contamination is foreign material that can be
found by sight, touch, or odor. Visible contamination
can cause a sudden failure of components. Exam­
ples of visible contamination:
(A) Particles of metal or dirt in the oil.
(B) Air in the oil.
(C) The oil is dark and thick.
(D)The oil has an odor of burned oil.
(E) Water in the oil.
NOTE: The hydrostatic system does not have an external
bypass port. If the filter becomes plugged it bypasses the
filter. Upon completion of cleaning the hydraulic system
replace the hydrostatic system filter.
NOTE: Use the following procedure for Cleaning the Hy­
draulic System.
7. Prepare the portable filter by doing the following
steps:
(A) Remove all the hydraulic oil from the inlet and
outlet hoses for the portable filter.
(B) Remove the filter element from the portable filter.
(C) Remove all hydraulic oil from the portable filter.
(D) Clean the inside of the housing for the filter
element.
(E) Install a new filter element in the portable filter.
8. Determine whether the contamination is micro­
scopic or visible. Refer to: PRIMARY HYDRAULIC
POWER SYSTEM ­ Decontaminating (A.10.A)
9. If the contamination is microscopic:
(A) Check the maintenance schedule for the ma­
chine to learn if the hydraulic oil must be changed.
If necessary, change the hydraulic oil. Change the
hydraulic filter.
(B) Do steps 12 through 41.
10. If the contamination is visible, do the following steps:
(A) Change the hydraulic oil and hydraulic filter.
(B) Do steps 11 through 41.
11. Check the amount of contamination in the hydraulic
system by doing the following steps:
(A) Disassemble one cylinder in two different cir­
cuits. Check for damage to seals, scoring of the
cylinder wall, etc. Repair the cylinders as necessary.
(B) If, in your judgment, the damage to the cylinders
was caused by sever contamination and is not the
result of normal wear, it is necessary to remove,
clean and repair all valves, pumps, lines, cylinders,
hydraulic reservoir, etc.
To clean the lines refer to the following procedure:
TRANSMISSION Hydrostatic ­ Cleaning (C.20.F)
12. Remove the cap from the reservoir and install the
adapter on the reservoir. Start the vacuum pump.
13. Connect the vacuum pump to the adapter. Reser­
voir ­ Apply vacuum (A.10.A)
14. Start the vacuum pump.
15. The hydraulic reservoir is located at the rear of the
machine. Loosen and remove the drain plug from
the reservoir.
in the hydraulic system.
87630288 1 6/6/2007
A.10.A / 28