Internal air line installation (trailer only), Non-drive axle wheel end service – Spicer TPCS (Tire Pressure Control System) Service Manual User Manual
Page 36
36
Internal Air Line Installation
(Trailer Axles Only)
Figure 21 shows axle end air line routing.
Warning: Wear safety glasses.
Complete the axle end reassembly as follows:
1. Cut a length of
3
/
8
" nylon air brake tubing about 1
foot longer than the distance between the axle end
and the hole in the axle housing.
2. Slide a 6" section of
1
/
2
" nylon air brake tubing
over
the
3
/
8
" tubing to prevent chafing. Position
1
/
2
"
tubing 2" from the spindle end of the
3
/
8
" tubing.
See Figure 21.
3. Assemble the spindle end of the line as follows:
• Install the
1
/
4
" male NPT to
3
/
8
" nylon air brake
tubing fitting into the spindle adapter.
• Connect the end of
3
/
8
" nylon air brake tubing
with the
1
/
2
" nylon protector tubing to the
3
/
8
"
fitting.
4. With the help of an assistant, snake the tubing into
the axle end, through the drilled section and out
the threaded hole in the housing.
Note: Place a small amount of service removable thread
lock on the outside of spindle adapter before installation.
5. Using a bushing installer tool or a small block of
wood, drive the spindle adapter into the hole in the
axle end until seated.
6. At the top of housing, apply thread sealant and install
the axle adaptor nut over the tubing.
7. Pull the tubing taut to take up extra slack. Before
trimming off the excess tubing, make sure you have
a secure grip on the line to keep it from falling back.
8. Attach the tubing to flange connector using compres-
sion nut, compression fitting, and insert.
9. Insert flange connector into adaptor nut. Secure with
flange nut.
Caution: Be careful not to rotate the flange connec-
tor as this may damage tubing. Wrench flats are
provided on flange connector to hold in position.
Figure 21 Axle End Air Line Routing
D O T
1
D O T
2
3
1
4
2"
6"
6" of Nylon Air
Brake Tubing
5
6
7
Note: Area highlighted shows typical connections. Actual fittings may vary by vehicle manufacturer.
1.
3
/
8
" nylon air brake tubing
with compression nut
2. Flange nut
3. Flange connector
4. Axle adapter nut
5.
1
/
4
" male NPT to
3
/
8
" nylon air
brake tubing fitting
6. Spindle adapter
7. Rotary joint
!
!