HYDRAULICS
8C-5
SECTION 8C. GENERAL INSTRUCTIONS
GENERAL
NOTE:
Component location illustrations and hydraulic
system diagrams are located at the end of this
section.
The following general instructions apply to all hydraulic
system service procedures. Carefully read and adhere
to each precaution.
• Dirt in the hydraulic system will cause damage to the
system components and reduce the life of the
machine. Clean all dirt from around the fittings and
components before disconnecting any hydraulic
lines or removing any components.
• Relieve system pressure at the components or
hydraulic lines by slightly loosening the line fitting
before removing.
• Immediately, after disconnecting a hydraulic line,
cap the line fitting and plug the port of the removed
component from the machine. This not only
prevents the entry of dirt into the system, but also
eliminates the loss of hydraulic fluid.
• Identify and label all linkages, hydraulic lines, and
components parts. Mark the pump and motor
sections before removal and disassembly. This will
ensure the correct order of parts during reassembly
and installation.
• Drain the hydraulic fluid from the components before
disassembly.
• Discard all seals and o-rings as they are removed.
Install new seals and o-rings during reassembly.
Most seals are available in component kit form from
your Jacobsen dealer.
• All parts should be thoroughly cleaned in a suitable
non-flammable solvent and air blown dry before
beginning repair or reassembly.
• Perform repair procedures in a clean work area
using clean tools.
• Do not force or pry components apart or together.
Light tapping with a plastic mallet is recommended
unless otherwise specified in the repair instructions.
• Unless otherwise indicated, apply a light coat of
clean hydraulic fluid to parts as each is
reassembled. Apply clean grease to o-rings, if
necessary, to hold them in position during
reassembly.
• Hydraulic hose and tube lines should be inspected
daily to check for loose connections, kinks, worn, or
cut hoses, etc. Be sure tubes and hoses do not
contact other frame parts which could cause
abrasive wear. Always replace worn hose or tube
assemblies before operating machine.
HYDRAULIC TUBE AND HOSE
FITTINGS
CAUTION
Do not use steam or high pressure washers to clean
hydraulic components.
CAUTION
If, during the disassembly of any hydraulic compo-
nent, metal chips or damage is found, the hydraulic
system must be drained, thoroughly flushed with
clean oil and then refilled.
CAUTION
Always check the hydraulic tank level after removing
and installing a hydraulic component or line. Severe
damage to system components can result if they are
allowed to run dry.
WARNING
To avoid serious bodily injury, always lower mower
fully, place all controls in neutral and shut off the
engine before inspecting the hydraulic lines or
hoses. Never run hands across tubes, hoses, or fit-
tings to check for leaks. Hydraulic fluid escaping
under pressure can have sufficient force to pene-
trate skin and may cause infection in a minor cut or
opening in the skin.
8C
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