Safety Interlock System Tests; Engine; Fuel Recommendations - Murray MYZ4219000 Operator's Manual

Safety Interlock System
Tests
This machine is equipped with a Safety Interlock System. Do
not attempt to bypass or tamper with the switches and
devices.
DANGER: Mowing in reverse can be
hazardous to bystanders. Tragic accidents can occur if
the operator is not alert to the presence of children.
DO NOT mow in reverse if children are present.
Children are often attracted to the machine and the
mowing activity.
WARNING: If the machine does not pass the five
tests below do not operate the machine.
See an Authorized service center.
Test 1 — Engine will NOT crank if:
Power Take Off (PTO) switch is ENGAGED, OR
•
Parking brake is NOT fully set (drive control levers not in
•
the outward position).
Test 2 — Engine will crank and start if:
PTO is DISENGAGED, AND
•
Parking brake is fully set (drive control levers set in the
•
outward position).
Test 3 — Engine will SHUT OFF if:
Operator rises off seat with PTO switch ENGAGED, OR
•
Operator rises off seat with parking brake NOT fully set
•
(drive control levers not in the outward position).
Test 4 — Mower Blade Stopping Time Check
The mower blades and mower drive belt will come to a
complete stop in five seconds after the PTO switch is
DISENGAGED. If the mower drive belt does not stop in five
seconds, see an Authorized Service Dealer.
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Engine

Check and Add Engine Oil
Use Briggs & Stratton ® Warranty Certified oils for best
performance. Other high-quality detergent oils are
acceptable if classified for service SF, SG, SH, SJ or higher. Do
not use special additives. Outdoor temperatures determine
the proper oil viscosity for the engine. Use the chart to
select the best viscosity for the outdoor temperature range
expected.
E
A
B
D
C
Fig. 10
SAE 30 - Below 40 °F (4 °C) the use of SAE 30 will
A
result in hard starting.
10W-30 - Above 80 °F (27 °C) the use of 10W-30 can
B cause increased oil consumption. Check oil level more
frequently.
C 5W-30
D Synthetic 5W-30
E Vanguard Synthetic 15W-50
®
*Below 40 F ( 4 C ) the use of SAE 30 will result in hard starting.
° °
**Above 80 ° f ( 27 ° C ) the use of 10W-30 can cause increased oil consumption.
Stop the engine and remove the key. Make sure that the
•
oil fill area is clean.
Remove the engine oil dipstick (a, Fig.11). Wipe the
•
dipstick clean, ensuring no oil remains.
Install and tighten the dipstick.
•
Remove the dipstick again and check the oil level.
•
Make sure that the oil level is around the middle of the
•
FULL mark on the dipstick. (Fig.12).
ZERO TURN MOWER
If the oil level is FULL, install and tighten the dipstick.
•
If the oil level is LOW, add oil into the oil fill tube. (Fig. 12)
•
Wait one minute and check the oil level again.
•
If engine oil is sufficient, install and tighten the dipstick.
•
a
Fig. 11
Fig. 12
ZERO TURN MOWER

Fuel Recommendations

Fuel must meet these requirements:
Clean, fresh, unleaded gasoline.
•
A minimum of 87 octane. For high altitude, see section
•
below.
Gasoline with up to 10% ethanol (gasohol) is acceptable.
•
NOTICE: Do not use unapproved gasoline, such as E15
and E85. Do not mix oil in gasoline or modify the engine
to run on alternate fuels. Use of unapproved fuels will
damage the engine components, which will not be
covered under warranty.
To protect the fuel system from gum formation, mix a fuel
stabilizer into the fuel. See Storage section. All fuel is not
the same; if start or performance problems occur, change
fuel providers or brands. This engine is certified to operate
on gasoline.
High Altitude
At altitudes over 5,000 feet (1524 meters), a minimum of 85
octane gas is acceptable.
For carbureted engines, high altitude adjustment is required
to maintain performance. Operation without adjustment
will cause decreased performance, increased fuel consump-
tion, and increased emissions. Contact a Briggs & Stratton
Authorized Service Center for high altitude adjustment
information. Operation of the engine at altitudes below
2,500 feet (762 meters) with the high altitude adjustment is
not recommended.
Add Fuel
WARNING: Fuel and its vapors are
extremely flammable and explosive. Always handle fuel
with extreme care. Failure to observe these safety
instructions can cause fire or explosion which could
result in severe burns or death.
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