Bleeding The Hydraulic System - Toro TITAN ZX 4800 Operator's Manual

Installing the Hydraulic System Filters
Service Interval: After the first 50 hours
Every 400 hours
1. Apply a thin coat of oil on the surface of the rubber
seal of each filter (Figure 48).
2. Turn the filter clockwise until rubber seal contacts the
filter adapter then tighten the filter an additional 3/4
to 1 full turn (Figure 48).
3. Repeat step 2 for the other filter.
4. Align the filter guards over each filter; refer to step 4 of
Removing Hydraulic System Filters (page 37).
5. Secure the filter guards with the 3 screws removed in
step4 of Removing Hydraulic System Filters (page
37)Use the three screws to secure the filter guards.
6. Add oil to the hydraulic system as follows:
A. Ensure that the vent plugs and reservoir cap are
removed before adding the oil (Figure 46 and
Figure 47).
B. Slowly pour the specified oil through expansion
reservoir until oil comes out of one of the vent
plug holes and stop filling (Figure 47).
C. Install that vent plug (Figure 47).
Note: Torque the plug to 20.3 N-m (180 in-lb).
D. Add oil through the expansion reservoir until oil
comes out of the remaining vent plug hole on the
second transmission and stop filling (Figure 47).
E. Install that vent plug (Figure 47).
Note: Torque the plug to 20.3 N-m (180 in-lb).
7. Add oil through the expansion reservoir until it reaches
the FULL COLD line on the expansion reservoir and
install the cap for the reservoir (Figure 46).
8. Bleed the hydraulic system; refer to Bleeding the
Hydraulic System (page 38).
Important: Failure to perform the Bleeding
the Hydraulic System procedure after changing
hydraulic filters and oil may result in irreparable
damage to the transaxle drive system.

Bleeding the Hydraulic System

1. Raise the rear of machine up and support with jack
stands (or equivalent support) just high enough to
allow drive wheels to turn freely.
1. Jacking points
2. Go to the operator's position.
3. Start engine and move throttle control ahead to 1/2
throttle position.
4. Disengage parking brake.
5. Cycle the hydraulic system by performing the following:
A. Move the bypass levers rearward and then down
to lock them in place (valve open position); refer
to To Push the Machine (page 24).
B. With the bypass valves open and the engine
running, slowly move the motion control levers in
both forward and reverse (5 or 6 times).
C. Move the bypass levers up to unlock them and
forward (valve closed position); refer to To Push
the Machine (page 24).
D. With the bypass valve closed and the engine
running, slowly move the directional control in
both forward and reverse directions (5 to 6 times).
6. Stop the engine and check the oil level in the expansion
reservoir. Add the specified oil as until it reaches the
FULL COLD line on the expansion reservoir (Figure
46).
7. Repeat step 5 until all the air is completely purged from
the system.
Note: When the transaxle operates at normal noise
levels and moves smoothly forward and reverse at
normal speeds, then the transaxle is considered purged.
8. Check the oil level in the expansion reservoir one last
time. Add the specified oil as until it reaches the FULL
COLD line on the expansion reservoir if necessary
(Figure 46).
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Figure 49