Jacobsen HR 5111, Service And Repair Instructions

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GENERAL
NOTE
Component location illustrations and hydraulic
diagrams are located at the end of this section.
The following general instructions apply to all hy-
draulic system service procedures. Carefully read and
adhere to each precaution.
•
Dirt in the hydraulic system will cause damage to
system components and reduce the life of the ma-
chine. Clean all dirt from around fittings and compo-
nents
before disconnecting any hydraulic lines or
removing components.
•
Relieve system pressure at components or hy-
draulic 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 pre-
vents the entry of dirt into the system but also elimi-
nates the loss of hydraulic fluid.
•
Identify and label all linkages, hydraulic lines and
component parts. Mark the pump and valve sections
before removal and disassembly. This will ensure
the correct order of parts during reassembly and
installation.
•
Drain hydraulic fluid from components before disas-
sembly.
•
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 Distributor.
•
All parts should be thoroughly cleaned in a suitable
non-flammable solvent and air blown dried 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 instruction.
•
Unless otherwise indicated, apply a light coat of clean
hydraulic fluid to parts as each is reassembled. Ap-
ply 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 con-
tact other frame parts which could cause abrasive
wear. Always replace worn hose or tube assemblies
before operating machine.
HYDRAULIC TUBE AND HOSE FITTING
37° FLARE FITTINGS
Torque Recommendations
1. Assemble tube nut adapter to fitting with minimum
torque (finger tight) until flare contacts seat on fit-
ting body.
2. For tightening reference, mark a line lengthwise
on the flats of both the nut and adapter fitting with
a marker as shown in Figure 8C-1.
HYDRAULICS
SECTION 8C. GENERAL INSTRUCTIONS
8C-1
8C
!
CAUTION
Do not use steam or high pressure washers to
clean hydraulic components.
!
CAUTION
If, during the disassembly of any hydraulic com-
ponent metal chips or damage is found the hy-
draulic system must be drained, thoroughly flushed
with clean oil and then refilled.
!
WARNING
Always check hydraulic tank level after removing
and installing a hydraulic component or line. Se-
vere damage to system components can result if
they are allowed to run dry.
!
WARNING
To avoid serious bodily injury, always lower mow-
ers fully, place all controls in neutral and shut off
engine before inspecting hydraulic lines or hoses.
Never run hands across tubes, hoses or fittings
to check for leaks. Hydraulic fluid escaping under
pressure can have sufficient force to penetrate
skin and may cause infection in a minor cut or
opening in the skin.