JLG TOUCAN DUO Service Manual page 33

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g.If fluid returns to the tank, check the voltage at
the coil's terminals. If no voltage, check the
right solenoid wiring (refer to § 5.1 "Electrical
schematics"). Otherwise, replace the solenoid
or the assembly if necessary.
Check also the pressure relief valves for
contamination. If contaminated, clean and check
the fluid in the system.
6. If pressure is low or erratic, the probable causes
could be : incorrect fluid viscosity, air leak or
restriction in inlet line, pump internal parts stuck,
distance between parts increased due to wear.
Solutions are as follows :
a. If incorrect fluid viscosity, replace with oil of
manufacturer's recommended grade. (refer to
§ 3.13).
b. If air leak or clogged inlet line, repair or clean.
c. If pump internal parts stuck, check the parts
for any burrs or check the fluid for metal
particles. Clean and fill with the correct fluid.
d. If distance between internal parts increased due
to wear, replace the pump assembly.
e. Check the power unit relief valve for
contamination. If contaminated, clean it, check
its setting and check the fluid in the system.
(refer to § 4.5).
Models
Updated 06-2015
GENERAL
TOUCAN Duo
7. If excessive wear, the probable could be : dirt in the
fluid, oil viscosity too high or too low, pressure
above pump rated capacity, air leak or restriction
in inlet line causing cavitation.
Solutions are as follows :
a. If dirt in the fluid, check the cause of
contamination. Clean the filter and repair or
replace the worn parts. Replace if necessary
with a new pump. Replace the fluid with fluid of
recommended grade. (refer to § 3.13).
b. If fluid viscosity too high or too low, replace with
recommended fluid (refer to § 3.13).
c. If pressure above pump rated capacity, check
the relief valve for proper functioning.
d. If air leak or restriction in the system causing
cavitation, repair any leak in the system, check
the wear of parts and replace if necessary.
8. If internal parts are broken, the probable causes
could be : pressure above pump maximum rated
capacity, failure due to lack of fluid, or abrasive
contaminants in the fluid going through the filter.
Solutions are as follows :
a. If excessive pressure, above pump maximum
rated capacity, check the good working order of
the parts and repair.
b. If failure due to lack of fluid, check the fluid level
in the tank, and for any restriction in the inlet line
or for any clogged filter.
c. If abrasive contaminants in the fluid going through
the filter, check the fluid in the reservoir, check
the inlet line for any restriction and check the
cleanliness of the filter.
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