Ariens Sierra 936014-026 Service Manual page 30

NOTE: The correct bore diameter for the block is
0.6776" to 0.6784" and the pistons should be 0.6767"
to 0.6770".
26.Remove the motor shaft, washers and bypass
plate from the center section and inspect for
unusual wear or damage.
27.Inspect the center section running surfaces for
unusual wear or damage.
28.Remove the pump block assembly, block thrust
washer and spring from the input shaft and inspect
for unusual wear or damage. The pistons should fit
with very little side clearance in the block bores,
but must slide freely.
NOTE: The correct bore diameter for the block is
0.6295" to 0.6303" and the pistons should be 0.6288"
to 0.6291".
29.Remove the two internal hex head cap screws
retaining the jackshaft to the housing with a 5mm
hex wrench and remove the jackshaft/pinion gear
assembly from the housing.
30.Inspect the jackshaft running surface for excessive
wear or damage. The jackshaft should be 0.4986"
to 0.4996".
31.Inspect the pinion gear bore for excessive wear or
damage. The bore should be 0.5014" to 0.5024".
32.Inspect the pinion gear teeth for excessive wear or
damage.
33.If excessive wear or damage was found, the
complete assembly should be replaced.
Figure 36
34.Remove the motor thrust bearing assembly,
swashplate kit and cradle bearing from the housing
and inspect for unusual wear or damage.
35.Remove the slot guide from the displacement
control shaft.
36.Remove the bypass actuator from the housing.
37.Reposition the housing and remove the input shaft
tip seal from the housing bore. A hook type tool
may be used to pry the seal out. Care must be
taken to avoid damage to the housing bore, shaft
sealing surface or bearing. Once removed, the seal
is not reusable.
38.Remove the input shaft bearing ring.
39.Remove the pump input shaft assembly from the
housing.
40.Inspect the shaft and bearing for unusual wear or
damage.
41.Reposition the top housing and remove the
displacement control shaft and lip seal.
42.Inspect the housing for damage.
Replacement of Parts
All parts should be thoroughly cleaned in a suitable
solvent. All sealant material MUST be removed from
the housing halves prior to reassembly.
1. Inspect all parts for damage, nicks or unusual wear
patterns. Replace all parts having unusual,
excessive wear or discoloration.
2. Inspect the sealing surfaces, bearing surfaces, and
shaft splines. Polish the sealing areas on the
shafts if necessary. Replace any worn or
damaged parts.
NOTE: The running surfaces of the cylinder blocks
MUST be flat and free from scratches. If scratches or
wear are found on the running surface of the cylinder
block or center section, polish or replace the parts.
when polishing these surfaces, up to 0.0004" may be
removed. If this is not sufficient to obtain a flat surface
free of scratches, the part should be replaced.
3. Clean and lightly oil parts prior to assembly of the
transmission.
4. Be sure to torque all threaded parts to the
recommended torque levels.
5. Replace all o-rings and shaft seals.
CAUTION: Most parts have critical high
tolerance surfaces. Care must be exercised to
prevent damage to these surfaces during
assembly. Protect exposed surfaces,
openings and parts from damage or foreign
material.
936-31
6. Install the displacement control shaft.
7. Install the pump input shaft assembly and retaining
ring into the housing.
8. Install the pump shaft lip seal.
9. Reposition the upper housing and install the cradle
bearings.
10.Install the slot guide block onto the displacement
control shaft.
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