Service Manual

46 ZT-2100
Refer to Figures 10-19.
Disassembly
1. Remove the bypass arm and control arm.
See page 39.
2. Drain the oil from the transaxle. See page
11.
3. Remove the side cover. See page 42.
4. Remove the reduction gears. See page
43.
5. Remove the motor shaft. See page 44.
6. Remove the input shaft and bypass rod. See
page 45.
7. (See Figure 10) Remove the swashplate
(40) and pump cylinder block (131) as one
assembly. NOTE: Removal will be aided by
applying a small amount of pressure on the
trunnion mounted swashplate towards the
center section. Also note that the control arm
(44, page 39) may be loosely assembled at
this point to assist in swashplate removal.
While gently removing the swashplate and
block assembly, keep the block face ush
with the center section to minimize damage
to the running surface.
8. (See Figure 11) Disassemble the pump
cylinder block (131) from the swashplate
(40).
9. (See Figure 12) Check each piston for
proper operation by pressing the pistons in
and releasing them in the block bore. Dis-
assemble the pump cylinder block. Check
for piston/block wear in the cylinder bore.
Inspect the pistons (A), piston springs (C)
and thrust washers (B) for excessive wear
or damage. NOTE: Thrust washers may be
held in place in the piston by residual oil.
10. Reassemble the pistons, springs and wash-
ers into the cylinder block and set aside.
11. (See Figure 13) Remove the thrust bearing
assembly (60) from the swashplate (40).
(Center Section/Filter)
12. (See Figure 14, 15, and 16) Remove the
center section mounting screws (27). NOTE:
The center section is under motor block pis-
ton spring pressure. These screws are fac-
tory installed to 700 lb-in (80 Nm) and use
an anaerobic thread adhesive. A breaker
bar will be required at this step. Clean the
internal threads of the mounting holes with
compressed air.
13. Remove the center section and lter as-
sembly (20, Figure 15). NOTE: Bypass
plate (Figure 16) may slide out of the center
section.
14. Remove the lter cover by pressing in and
down on the lter cover tabs. Discard the
cover.
15. Note the location of both check plugs (25)
before removal for correct replacement
during reassembly. Remove and inspect
the check plug assemblies (25) for debris
or damage.
16. Remove the lter base (23) and discard it.
NOTE: The lter base is included in the lter
kit to be installed during reassembly of the
unit.
(Motor Block)
17. (See Figure 17) Remove the motor cylin-
der block assembly (130) from the housing
(1).
18. Disassemble the motor cylinder block as-
sembly (130). Check each piston for proper
operation by pressing the pistons in and re-
leasing them in the block bore. Disassemble
the motor cylinder block. Check for piston/
block wear in the cylinder bore. Inspect the
pistons, piston springs and thrust washers
for excessive wear or damage.
HYDRAULIC COMPONENTS