PS Magazine - TB 43-PS-627

PS, The Preventative Maintenance Monthly

ISSUE 627

FEBRUARY 2005
PS Magazine - TB 43-PS-627 - Page 12 of 33
PS 627
FEB 05
21
Small Emplacement Excavator…
O
perators, your small emplacement excavator just came back from the RECAP program
looking show-room new and ready to go.
If your mission involves loading dump trucks, though, eyeball the steel lines on the boom
lift cylinders before you lift one bucketful. Make sure the lines are facing up—on top of the
cylinders.
Facing down, the lines take a real beating. Get the load close to the truck and the lines
hit the side of the truck. Constant banging crushes the lines. Then they leak or burst during
operation.
Your mechanic
can fix that by
turning the
cylinder over
so the lines
are on top.
here’s how…
keep these tips in
mind
before
you load
the next pile of sand!
Turn
Lines
Around
1.
Park the excavator on a
hard, level surface.
2.
Raise the bucket about
30 inches and set a jackstand at
the inside of each side of the
lower boom crossmember.
3.
Now lower the lower
boom crossmember on the
jack stands.
4.
As the bucket slowly
uncurls, keep an eye on
the jacks. You want the
crossmember to rest safely
on both stands.
5.
Shut down the engine.
6.
Relieve the pressure on
the hoses using the control
levers in the cab for the
boom and bucket cylinders.
7.
Remove the clamps
holding the four hydraulic
hoses between the left and
right loader boom.
8.
Remove the retaining bolt on
the left boom lift cylinder (not the
rod end) which holds the cylinder
pivot pin.
11.
Rotate the cylinder 180°. This puts the steel
lines on top of the cylinder.
12.
Put the cylinder retaining pin back in,
then the retaining bolt.
9.
Loosen the A and B port swivel
nuts at the 90° elbows (steel line end).
Just loosen ‘em, don’t take ‘em off.
13.
Tighten the two elbow fittings. Make sure
the elbows are equally spaced between the lower
part of the boom and the boom’s lift cylinder.
10.
Hold the cylinder while your buddy
pulls out the cylinder pin.
15.
Tighten down the hose clamps.
Now start the
engine and check
for hydraulic
leaks. Operate
the boom to
make sure you
have enough
clearance when
you dump a load
into a truck.
there. isn’t
that better?
you know it!
my hoses are
out of harm’s
way now!
14.
Make sure the hoses are not kinked or
interfering with the boom.
once you finsih
step 15, One side
will be done.
Then Do the same
thing for the
other side.
627.20-21(C)
12/24/04
2:39 PM
Page 1
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