HYDRAULIC SYSTEM INFORMATION
IMPORTANT
When repairing
hydrostatic
and
hydraulic
systems, clean the
work
area
before
disassembly and keep all parts clean.
Always
use caps
and
plugs
on
hoses, tubelines
and
ports
to
keep
dirt
out.
Dirt
can
quickly
damage
the system.
1-2003-0888
Flare Connections
Use
the following procedure to tighten the flare fitting:
Tighten the nut
until it makes contact with the seat.
Make a mark across the
flats of both the male and female
parts of the connection
[A]
.
Use
the chart to find the correct tightness needed
[B].
If
the fitting leaks after tightening, disconnect it and
inspect the seat area for damage.
O-ring
Face Seal Connection
When installing this fitting, the O-ring must be first
lubricated. Loosen the jam nut,
install the fitting into place,
then tighten the jam nut. Tighten the jam nut until it and
the washer are tight against the surface [C].
Tubelines And Hose
Make replacement of tubelines which are bent or have
become
flat. There will be restriction of fluid flow, which
will give a slow hydraulic action and cause heat.
Make replacement of hoses which show signs of wear,
damage or weather cracked rubber.
When
installing tubelines or hoses, make sure you use
two wrenches when loosening and tightening them.
A
B
Wrench Size
5/S"
11/16"
7/S
"
1"
1-1/4"
1-3/S"
2"
2-1/4"
c
-2-2-
Mark
a Line on Nut
Flats
of
Both
Nuts
~
Tighten
to
Correct
Amount
from
Chart
~I
A-01897
Tube Size
Rotate No.
Outside
Oia Thread Size
of
Hex Flats
5/16"
1/2"
- 20
2-1/2
3/S
" 9/16"
-1S
2
1/2" 3/4"
-16
2
5/S" 7/S" - 14 1-1/2 - 2
3/4" 1-1/16"
-12
1
1"
1-5/16"
-12
3/4-1
1-1/4
" 1-5/S" -
12
3/4
-1
1-1/2"
1-7/S"
-12
1/2 - 3/4
A-01852
741, 742, 743, 7430S Bobcat Loader
Service Manual
To Next Page
Loading...