Hydraulic Hoses; Hydraulic Oil - Jacobsen R-311T Parts & Maintenance Manual

4.12 HYDRAULIC HOSES _______________________________________________________

WARNING
!
To prevent serious injury from hot, high pressure oil,
never use your hands to check for oil leaks, use paper or
cardboard.
Hydraulic fluid escaping under pressure can have
sufficient force to penetrate skin. If fluid is injected into
the skin it must be surgically removed within a few hours
by a doctor familiar with this form of injury or gangrene
may result.
NOTICE
Care must be used at all times to avoid any
contamination of the hydraulic system.
recommended maintenance practices and adhere to
scheduled intervals for hydraulic oil and filter changes.
Introduction of any type of contamination may result in
operating issues by causing valves to stick or leak
internally.
1. Always lower implements to ground, disengage all
drives, engage parking brake, stop engine, and remove
key before inspecting or disconnecting hydraulic lines
or hoses.
2. Check visible hoses and tubes daily. Look for wet
hoses or oil spots. Replace worn or damaged hoses
and tubes before operating the machine.

4.13 HYDRAULIC OIL___________________________________________________________

Refer to Section 6.3 for specific maintenance intervals.
Drain and replace the hydraulic oil after a major component
failure, if you notice the presence of water or foam in the oil,
or a rancid odor (indicating excessive heat).
Always replace the hydraulic filter when changing oil.
To change hydraulic oil:
1. Clean the area around the oil cap to prevent impurities
from entering and contaminating the system.
a. Oil temperature should be between 60° to 90°F
(16° to 32°C). Do not check oil level when oil is hot.
b. The main oil tank level should be 2 inches below
filler neck. Do not overfill.
2. Drain and replace the hydraulic oil yearly or after a
major component failure, or if you notice the presence
of water, foam, or a rancid odor.
3. The replacement tube or hoses must be routed in the
same path as the existing hose, do not move clamps,
brackets, or ties to a new location.
4. Thoroughly inspect all tubes, hoses, and connections
every 250 hours.
IMPORTANT: The
permanently
contaminated. Before disconnecting any hydraulic
component, clean the area around the fittings and the
hose ends to keep impurities out of the system.
a. Before disconnecting any hydraulic component,
tag or mark the location of each hose then clean the
area around the fittings.
b. As you disconnect the component, be prepared to
Follow
assemble plugs or caps to the hose ends and open
ports. This will keep impurities out of the hydraulic
system and also prevent oil spills.
c. Make sure "O" rings are clean and hose fittings are
properly seated before tightening.
d. Keep the hose from twisting. Twisted hoses can
cause couplers to loosen as the hose flexes during
operation resulting in oil leaks.
e. Kinked or twisted hoses can restrict the oil flow
causing the system to malfunction and the oil to
overheat and also lead to hose failure.
3. Remove drain plug from bottom of main tank and
loosen or remove breather cap. Check and clean the
breather cap, replace as necessary.
4. After oil has drained install drain plug and fill with
Jacobsen Hydraulic oil.
5. Purge air from system.
6. Operate all mower functions for about 5 minutes to
purge air out of the system and stabilize the oil level. Fill
tank to full level.
MAINTENANCE
hydraulic system
damaged if the oil
4
can be
becomes
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