Toro 74920 TITAN ZX4820 Operator's Manual page 42

Removing Hydraulic System Filters
Important: When the hydraulic oil filter is removed, all
of the hydraulic oil in each transaxle will drain out. Use
a container that will handle 4.495 liters (152 oz) or larger.
1. Stop engine, wait for all moving parts to stop, and
allow engine to cool. Remove the key and engage the
parking brake.
2. Locate the filter and guards on each transaxle drive
system (Figure 58). Remove three screws securing the
filter guard and guard.
5
3
4
Figure 58
Right side shown
1. Transaxle drive
2. Oil filter
3. Filter guard
3. Carefully clean the area around the filters. It is
important that no dirt or contamination enter the
hydraulic system.
4. Place a container below the filter to catch the oil that
drains when the filter and vent plugs are removed.
5. Locate and remove the vent plug on each transmission
6. Unscrew the filter to remove and allow oil to drain
from the drive system.
Repeat this procedure for both filters.
Installing the Hydraulic System Filters
Service Interval: After the first 50 hours
Every 400 hours
G010254
1
2
4. Screws
5. Vent plug
1
3
5
1. Apply a thin coat of oil on the surface of the rubber
seal of each filter.
2. Turn the filter clockwise until rubber seal contacts the
filter adapter then tighten the filter an additional 3/4 to
1 full turn. Repeat for the other filter
3. Install the filter guards over each filter as previously
removed. Use the three screws to secure the filter
guards.
4. Verify the vent plugs are removed before adding the oil.
5. Slowly pour the specified oil through expansion
reservoir until oil comes out of one of the vent plug
holes. Stop and install that vent plug. Torque the plug
to 180 in-lb (20.3 N-m).
6. Continue to add oil through the expansion reservoir
until oil comes out of the remaining vent plug hole on
the second transmission. Stop and install that vent
plug. Torque the plug to 180 in-lb (20.3 N-m).
7. Continue to add oil through the expansion reservoir
until it reaches the FULL COLD line on the expansion
reservoir. Proceed to the Bleeding the Hydraulic
System section.
Important: Failure to perform the Bleeding
the Hydraulic System procedure after changing
hydraulic filters and oil can result in irreparable
damage to the transaxle drive system.
42
2
4
6
3/4
Figure 59
G008748