Honda FL6555 Operator's Manual page 42

SERVICE
Lift and Bucket Cylinder Leakage Test
Rod Packing Set Leakage Test
Start tractor and "retract" cylinders
completely.
Continue to hold control valve lever in position
to 'retract cylinders" and check for evidence
of oil leakage past the rod packing set
(external leakage).
On cylinders that have been in service, rod
packing set leakage is usually indicated by
accumulation of dirt/oil at rod end of cylinder
body.
If oil leakage is evident, shut tractor off and
turn cylinder end cap l/4 turn clockwise to
tighten gland packing set seals.
Recheck for oil leakage and repeat tightening
procedure until oil leakage stops.
1-1 Rod packing set seals should not be
over-tightened as this will reduce service life.
If leakage cannot be stopped, excessive wear
or damage or rod packing set component(s)
is indicated and the cylinder(s) should be
removed and disassembled for inspection
and repair.
Inspect cylinder rod for pitting, deterioration
or damage to the chrome finish. Any
excessive damage to the chrome finish
reduces the ability of the rod packing set to
seal properly.
If rod packing set tests are satisfactory,
proceed to piston seal assembly leakage test.
Piston Seal Assembly Leakage Test
With cylinders in the fully "retracted" position
and tractor shut off, disconnect the hydraulic
lines from the base end port of cylinders.
Route a hydraulic hose from the cylinder base
end ports to a container (to catch oil during
leakage test).
Start tractor and place loader control valve
lever in the position to 'retract" cylinders and
"hold".
Check for oil leakage from base end port of
cylinder.
A constant dripping or very slight flow of oil is
normal. If a steady flow of oil -is evident
excessive wear or damage of the piston seal
is indicated and the cylinder(s) should be
removed and disassembled for inspection
and repair.
If piston seal leakage test in 'retract" position
indicates piston seal is satisfactory, reinstall
hydraulic hoses and dully extend cylinders to
perform test in "extend" position.
With cylinder in the fully "extended" position
and tractor shut off connect hydraulic lines to
base port and disconnect the hydraulic lines
from the rod end port of cylinders. Route a
hydraulic hose from the cylinder rod end ports
to a container (to catch oil during leakage
tests).
Start tractor and place loader control valve
lever in the position to 'extend" cylinders and
"hold". .
Check for oil leakage from rod end port of
cylinders.
A constant dripping, or very slight flow of oil
is normal. If a steady flow of oil is evident
excessive wear or damage of the piston seal
is indicated and the cylinder(s) should be
removed and disassembled for inspection
and repair.