Lit. No. 74236/74237/74238, Rev. 00
21
September 1, 2020
Hose or Fitting Replacement
DO NOT
use thread sealant/tape on hydraulic hoses
or
fi
ttings. These materials could damage the product.
Follow recommended replacement procedures for
fi
ttings and hoses.
1. Lower the blade completely. Unplug the control.
2. Remove
the
fi
ll plug.
NOTE: Remove
fi
ll plug slowly to relieve any
pressure in reservoir.
3. Loosen the hoses or
fi
ttings slowly to bleed o
ff
any
residual pressure.
4. Carefully note hose routings and the location of
any protective hose wraps, for proper reassembly.
5. To remove a hose, loosen and unscrew the hose
fl
are nut from the
fi
tting.
6. To remove a
fi
tting, loosen the jam nut and
unscrew the
fi
tting from the port.
WARNING
Lower the blade when the vehicle is parked.
Keep 8' clear of the blade. Temperature
changes could change hydraulic pressure,
causing the blade to drop unexpectedly or
damaging hydraulic components. Failure to
do this can result in serious personal injury.
Procedure for Installing Fittings and Hoses
NOTE: Overtightening the JIC hose
fi
tting ends
will result in a fractured
fi
tting.
DO NOT
use thread sealant/tape on hydraulic hoses
or
fi
ttings. These materials could damage the product.
Always use two wrenches to ensure proper tightening
of
fi
ttings and hoses.
Use the following procedure to install SAE O-ring
fi
ttings in the valve block and rams:
1. Turn the jam nut on the
fi
tting as far back as
possible.
2. Lubricate the O-ring with clean hydraulic
fl
uid.
3. Screw
the
fi
tting into the port by hand until the
washer contacts the port face and the shoulder of
the jam nut threads.
4. Unscrew
the
fi
tting to its proper position; no more
than one full turn.
5. Using two wrenches, hold the
fi
tting body in
position and tighten the jam nut until the washer
again contacts port face, then tighten an additional
1/8 to 1/4 turn to lock the
fi
tting in place. Final
torque on the jam nut should be approximately
20 ft-lb.
Use the following procedure to install hydraulic
hoses:
1. Screw
the
fl
are nut onto the
fi
tting
fl
are and hand
tighten it.
2. Align the hose so that there are no twists or sharp
bends and so that it will not be pinched or pulled
by moving parts.
3. Using a pair of adjustable pliers, hold the hose in
position, and use a wrench to tighten the
fl
are nut
1/8 to 1/4 turn beyond hand tight. Final torque on
the
fl
are nut should be approximately 20 ft-lb.
4. Reinstall any protective hose wraps in their
original positions.
MAINTENANCE
