Toro Groundsmaster 5900 Series Service Manual page 306

Charging System Tests (continued)
Electrical System: InfoCenter Display
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1. 12 Volt alternator
The Groundsmaster 5900/5910 uses four (4) 12 Volt maintenance free batteries.
Two batteries are connected together in parallel to support the 12 Volt electrical
system and two (2) batteries are connected together in series to support the 24
Volt cooling fan circuit (Figure
12 volt alternator mounted to the engine, which is driven by a single row V-belt
(Figure 186). The 24 Volt system is charged by an 105 Amp 24 Volt alternator
mounted to the frame, which is driven by a multi-row V-belt.
Use the InfoCenter display to monitor the 12 Volt and 24 Volt systems. It will tell
you if the desired charging system has an output, but not its capacity.
1. Check to make sure each alternator drive belt is not loose, worn or damaged.
2. Turn the key switch to the RUN position and set the InfoCenter display to
view the voltmeter (see Info- Center Display −
(page 6–11)).
3. Record the initial system voltage for both the 12 Volt and 24 Volt system.
4. Start the engine and warm the engine to normal operating temperature.
5. Set the engine RPM to 2000 RPM.
12 Volt System Check:
• Turn on all additional 12 Volt system loads (e.g. lights, heater/AC blower).
• The 12 Volt system voltage should be at least 0.5 volt higher then the
initial voltage recorded in step 3.
• If the 12 Volt charging system performance is less than desired, see the
Yanmar Service Manual
information.
2
Figure 186
2. 24 Volt alternator
185). The 12 Volt system is charged by an 80 Amp
or Yanmar Troubleshooting Manual
Page 6–44
1
Operator Information Screen
for additional
Groundsmaster ® 5900 & 5910
16227SL Rev B