Pul-Blast
AR pump system
44
2
2
1
1
3
3
4
4
1
1
2
2
3
3
4
4
5
5
6
6
universal joint disassembly
Remove all (4) snap rings in cross assembly
1
.
Position joint in loose vice
2
. Strike top arm of unsupported yoke to
drive the top cup up. Repeat on the opposite side.
Grip loosened cup in vice
3
and strike yoke arm to drive yoke off
cup. Repeat on opposite cup.
Support cross in loose vice
4
and strike yoke arm to drive the top
cup up. Repeat on opposite side.
Repeat step
3
to remove the remaining two cups.
universal joint reassembly
Clean bearings
1
before assembling cross. Cups should be free from
dirt- and be certain the seal from the previous cross does not remain
in the cup. Smear grease in the clean bearing.
Make certain all needle bearings are seated properly.
Clean bearing seat in yoke arms. Check for burrs (in new yokes also).
File out any burrs: bearing seat should be smooth and clean.
Yoke arms must be true (see
true yoke test
, above).
If a yoke arm is
sprung
by striking with excessive force, the cross will
bind in operation.
Note
: Yoke arms must be true. If a yoke arm is
sprung
by striking
with excessive force, the cross will bind in operation.
True yoke test
- slide a machined rod
(a few thousandths under cup diameter)
through the yoke arms. The yoke must
be replaced if the yoke won’t slide com-
pletely onto the rod.
55 series rod diameter
1.530”
35 series rod diameter
1.247
Where a
spacer
is required, select a diameter that evenly distributes force
around the outer edge of the bearing cup. Choosing a spacer of insufficient
diameter or using no spacer at all will drive the bearings unevenly and
cause the joint to bind in operation.
You should assemble the joint in a clean area.
Insert the cup and cross
2
and drive in with a spacer.
Insert snap ring
3
.
Insert second cup
4
and hold cross in place to drive on cup. Drive cup
down with spacer and insert snap ring.
To loosen cross, strike yoke arm
5
and check cross for free rotation.
Position second yoke on cross
6
and repeat steps
2
to
5
.
