3-21
HYDRAULIC SEALS
W A R N I N G
Do not check for hydraulic leaks with hands. If a mist of hydraulic oil is noticed around
a line or component, use cardboard or other material to check for location of leak.
High pressure fluid leaking from a small hole, can be almost invisible, yet have enough
force to penetrate the skin. If injured by escaping fluid, see a doctor at once. Serious
reaction or infection can occur.
All hydraulic fittings and hose connections should be kept tight to prevent loss of fluid from the
system and unnecessary dripping from the machine. M ost hydraulic fittings on t he IC-200
crane use o-ring seals, and if tightening the fitting fails to stop the leak, the o-ring should be
replaced.
Notes:
1. When installing an o-ring fitting with an adjustable nut and washer, be sure to back off the
nut, washer and o-ring as far as possible bef ore threading the fitting into the port. Then
turn the fitting into the port as far as possible w ith fingers and t urn it backward until it is
oriented properly. Torque the nut with a wrench, while holding the fitting with a wrench.
2. Lubricate all seals before assembling.
3. Take care not to over tighten pipe threads.
4. Do not use Teflon tape to seal pipe treads. Loctite-type (anaerobic) sealant is preferred.
Leaks in com ponent parts, such as pum ps, valves and m otors, that cannot be stopped by
tightening bolts, can usually be stopped by replacing the seals in t he component. Seal and
packing replacement is the only maintenance which owners should at tempt on com ponent
parts, unless they have a well-equipped shop with mechanics trained in hydraulic component
overhaul.
Leakage in the pump suction line may not cause oil to appear externally, but may allow air to
enter the line during operation. The air entrained in the oil will cause pumps to be noisy, and if
allowed to continue, can damage the pump. If a pump becomes noisy, immediately check the
fluid level in t he reservoir and be sur e all suction fittings are tight. If noise continues, squirt
hydraulic fluid on the suction connections. Listen for a change in the noise and watch for oil
being sucked into a small opening in t he connection. When the reservoir is full, the shutoff
valve is open and all suct ion connections are tight, most pump noises will disappear. If they
do not, a worn or faulty pump is indicated. On a routine basis, all hoses should be check ed
for wear, deterioration, and physical damage. Defective hoses should be r eplaced for maxi-
mum economy for the user.
Courtesy of Crane.Market
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