Toro 74408 Z334 Z Master Operator's Manual page 39

1. Disengage the PTO, move the motion control levers
to the neutral locked position and set the parking
brake.
2. Stop the engine, remove the key, and wait for all
moving parts to stop before leaving the operating
position.
Important: Do not substitute automotive oil
filter or severe hydraulic system damage may
result.
3. Locate the two filters, one under each transmission
and remove the filter guards.
4. Carefully clean the area around the filters. It is
important that no dirt or contamination enter the
hydraulic system (Figure 50).
5. Unscrew the filters and allow the oil to drain from
the drive system (Figure 50).
Important: Before reinstalling new filters,
apply a thin coat of oil on the surface of the
filters rubber seal.
6. Install the new filters clockwise until rubber seal
contacts the filter adapter and then tighten the filter
an additional 3/4 to 1 full turn.
7. Remove the vent plug on each transmission and fill
through the hydraulic tank, when oil comes out of
vent reinstall plug. Torque the plugs to 180 in-lb
(244 N⋅m).
8. Add oil until it reaches the cold line on the hydraulic
tank (Figure 49).
9. Raise the rear of machine up just enough to allow
the drive wheels to turn freely and support it with
jack stands.
10. Start the engine and move the throttle control ahead
to the 1/2 throttle position. Disengage the parking
brake.
11. With the bypass valve open and the engine running,
slowly move the directional control in both forward
and reverse 5 or 6 times.
12. With the bypass valve closed and the engine
running, slowly move the directional control in both
forward and reverse directions 5 to 6 times. Stop
the engine and check the oil level, and add oil as
required to the hot line.
13. Repeat items 11 and 12 as necessary until all the air
is completely purged from the system. When the
transaxle operates at normal noise levels and moves
smoothly forward and reverse at normal speeds, then
the transaxle is purged.
Important: Do not change hydraulic system
oil (except for what can be drained when
changing filter), unless it is felt the oil has been
contaminated or been extremely hot. Changing
the oil unnecessarily could damage the hydraulic
system by introducing contaminates into the
system.
1. Left rear tire
2. Hydraulic filter
39
Figure 50
3. Vent plug