Tennant ATLV 4300 Service Manual page 152

Model 70160
Repair Information
28 With the retaining ring
removed, use a small press to
press the shaft seal and input shaft
assembly from the housing
assembly.
29 With the input shaft assembly
removed, disassemble the
assembly for inspection by
removing the shaft seal, washer,
retaining ring thrust washers and
bearing (see Figure 26).
Note: The rear pump on tandem
units uses a spacer in place of
shaft seals.
30 To remove the camplate from
the housing assembly, use a 9/16
in. socket or end wrench and
remove the three cap screws and
washers retaining the control arm cover plate assembly. Start
at the cover plate with control arm (see Figure 27).
31 With the retaining cap screws removed, insert two small
screwdrivers in the notches located
in the cover plate assembly and pry
upward. Make sure bearing cup
comes off with the cover plate (see
Figure 28).
Note: The crush ring in the control
arm trunnion cover does not need
to be removed (see Figure 29). The
only time the crush ring needs to
be removed is when either the
trunnion cover, the camplate
assembly or the housing assembly
is replaced. A shim kit is then
required in the crush ring's place.
32 Reposition the pump assembly
to remove opposite cover plate.
The bearing cup in this cover plate
is press fit and not removable.
Repeat steps 30 through 31.
32b Remove the slip fit bearing on
the non-control arm side of the
camplate.
33 With housing in the upright
position, slide the camplate toward the control side and lift it
from the pump housing (see Figure 30).
Note: The camplate control shaft will fit out either side of the
pump housing. Be sure to note on which side of the housing
the control shaft protrudes before removing camplate from
housing for correct reassembly orientation.
- Disassembly
Figure 25
34 Use an o-ring pick or similar tool to remove the o-ring
seals from the two counter-bores in the housing or the cover
plates (see Figure 31).
35 To remove the control side cover plate lip seal, use a small
Figure 26
press and press the lip seal inward
(see Figure 32).
Figure 27
36 Remove the thrust plate from
the camplate. The thrust plate is
reversible and either side may face
the camplate (see Figure 33).
37 Inspect the housing
assembly's front needle bearing. If
the needles remain in their cage
and move freely, replacement
usually is not required (see Figure
34).
Figure 28
38 When the needle bearing is
replaced, the numbered end of the
needle bearing must face away
from the housing and pressed to
the dimension as shown (see
Figure 35).
Figure 29
Figure 30
10
Figure 31
Numbered End
1.78 mm
[.07 in.]
Figure 35
Figure 32
Figure 33
Figure 34
Flange End of Housing