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Section 5: Maintenance & Lubrication
ZST40 & ZST48 Zero Turn Mowers 357-505M
Table of Contents
12/15/15
Transaxle Purging Procedures
It is critical that air is purged from the hydrostatic drive
system to keep it efficient. This is because compression
and expansion rate of air is higher than that of oil. This
purge procedure should be implemented any time the
hydrostatic system has been opened to facilitate
maintenance or after oil has been changed.
Symptoms of a hydrostatic system that has not been
purged may be:
1.
Noisy operation.
2.
Lack of power after operating mower a short time.
3.
High operation temperature and excessive
expansion of oil.
The following procedures are best performed with mower
rear drive wheels off the ground. Then repeated under
normal operating conditions. If this is not possible, then
the procedure should be performed in an open area free
of any objects or bystanders.
Refer to Figure 5-9:
1.
Pull back and up on the bypass valve rod loop ends.
Continue to hold the loop ends up against the engine
platform while releasing the rod, The upturned ends
on the loops should catch on the platform locking the
transaxle in free wheeling.
2.
Start engine and place both control levers in neutral.
Slowly move control levers completely forward and
reverse 5 to 6 times.
3.
Close both bypass valves by pulling back on the rods,
lowering them down, and slowly releasing them to
allow the springs to pull back on the rods.
4.
With engine running and control levers in neutral,
slowly move levers forward and reverse 5 to 6 times.
5.
Stop engine and check oil level in transaxles.
6.
It may be necessary to repeat Steps 1 to 5 until all air
is purged from the system and transaxle operates at
normal noise levels and travels at normal speeds.
Fuel System
Refer to Figure 5-10:
The fuel tanks are located on the mower’s fenders. Total
capacity of the fuel tanks is 3 U.S. gallons. Fill tank when
fuel shows low in the fuel sight gauge. Before filling, push
blade engagement switch
(OFF)
, move both control
levers
(OUT)
, set park brake
(ON)
, and turn switch key
(OFF)
. Allow engine to cool before filling tank.
IMPORTANT:
Before purging system, make sure
transaxles are properly filled with oil. See
“Transaxle Oil Check & Filling”
on page 35. For
transaxle oil specification, see page 45.
IMPORTANT:
The transaxle is considered purged
when transaxles are at the proper oil level, operate
at normal noise levels, oil temperatures are not
excessively high, and mower does not lack power.
Bypass Valve Rods (Operating Position Shown)
Figure 5-9
Clean dirt from around fuel tank cap. Remove cap and
begin filling. Do not fill fuel tank to the top. Fuel will
expand in hot weather and seep out through the fuel tank
vent system. When finished, screw cap back on until it
makes a clicking noise and ratchet action that can be
heard and felt when tight. Wipe up any spilled gasoline.
Use regular unleaded gasoline with an (R+M)/2 octane
rating of 87 or higher.
Land Pride recommends adding correct amounts of gas
stabilizer/conditioner in the fuel. For best results, follow
engine manufacturer’s directions. Using a fuel stabilizer/
conditioner in the fuel can provide benefits such as:
1.
Keeps gasoline fresh during storage of 90 days or
less. Drain fuel tank if storage is longer.
2.
Cleans engine during operation.
3.
Eliminates gum-like varnish build-up in the fuel system.
Left & Right Fuel Tanks
Figure 5-10
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Bypass Valve Rods
IMPORTANT:
The fuel system can be damaged if
the wrong fuel is used. Never use methanol, lead
gasoline, or unleaded gasoline containing more than
10% ethanol. Do not mix oil with gasoline.
Fuel Cap
Fuel Tank
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Fuel Sight Gauge
Fuel Vent
Valve
