PS Magazine - TB 43-PS-686
PS, The Preventative Maintenance Monthly
ISSUE 686
JANUARY 2010
50
PS 686
JAN 10
Keep Fittings Lubed
One of the grease Fttings missed is the one that lubes the backhoe’s dipper
pivot arm. That’s because the Ftting is out of sight, right under the bend (pivot) in
the arm.
Without lube, the pivot arm’s bearing can seize, causing the backhoe to bind.
Not good!
So, keep the pivot arm lubed. During
scheduled services, give the Ftting four
or Fve pumps of grease.
While you’re at the back of the vehicle
with grease gun in hand, a little lube goes
a long way when it comes to the grease
Ftting for the backhoe’s tilt cylinder.
This Ftting is usually passed over
because it’s in the dark when the backhoe
is in the transport position. With the
backhoe up, the Ftting is clear as day.
During scheduled services, pump four
or Fve shots of grease in the cylinder.
That
way
the
backhoe
will
move
smoothly back and forth.
Keep Bolts Torqued
Wear and tear loosens the bolts on the rear fender bracket, sway bar and platform.
Loose bolts chew into the vehicle’s frame. Then the rear fenders and frame begin to
fall apart during operations.
Before that happens, make
sure all bolts are torqued
properly. The fender bracket
bolts should be torqued to 220
lb-ft. Add 16mm hardened
washers, NSN 5310-01-305-
2539, to the platform bolts
and torque ‘em to 220 lb-ft.
±inally, add 14mm hardened
washers to the sway bar
bracket and torque the bolts
to 150 lb-ft.
Order the 14mm washers
on DD ±orm 1348-6 using
CAGE code 64678 and PN
6819900440.
SEE…
some basic pm puts
“slide and glide” in
backhoe operations.
keep these areas in mind
so your excavator isn’t
crying the backhoe blues.
Keep pivot arm lubed
TORqU±²f±nD±R²BRAck±³²BOL³s²³O²210-230²LB-f³
´DD²14MM²hARD±n±D²wAsh±Rs²³O²swAy²BAR²BRAck±³s
´DD²16MM
hARD±n±D²wAsh±Rs
³O²PLA³fORM²BOL³s
Curbµide
¶oadµide
686.50-51.indd
1-2
12/2/09
11:04:25 AM
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