Vanguard
TM
Twin-Cylinder OHV Liquid-Cooled Engine
Section 2 - Troubleshooting
Page 26
3. With battery fully charged, check specific gravity
readings of each cell with a Battery Hydrometer
and record readings, Fig. 33. All readings should
be above
1.250 (compensating for temperature). If
specific gravity readings varied
. 50 or if all cells
read less than
1.225, replace battery.
Fig. 33 - Checking 12 V Battery Cells (Lead
Acid, Wet Cell, Dry Charge)
Testing Battery
Use Digital Multimeter,
Tool #19464.
1. Set meter to read DC Volts.
2. Disconnect wires from spark plugs and ground
ignition using two Ignition Testers,
Tool #19368.
Attach
RED meter test clip to positive (+) battery terminal.
Attach
BLACK meter test lead to negative (-) battery
terminal.
3. Turn switch to
START.
METER SHOULD DISPLAY 9 VOLTS OR MORE
WHILE CRANKING ENGINE.
If less than 9 volts, replace battery.
Battery Recommendations
These battery size recommendations are based on
minimum temperature expected and correct weight of oil
being used.
30 Amp. Hr. +20°F (-6° C) or higher
40 Amp. Hr. -5° F (-20° C) or higher
50 Amp. Hr. -15° F (-26° C) or higher
Battery Cable Recommendations
These cable sizes are based on total length of cable
from battery positive post to starter switch or solenoid,
and to starter plus ground return to battery negative post.
#6 AWG - 4 ft. (1.2 m) or less
#5 AWG - 5 ft. (1.5 m) or less
#4 AWG - 6 ft. (1.8 m) or less
EQUIPMENT AFFECTING ENGINE
OPERATION
Frequently, what appears to be a problem with engine
operation, such as hard starting, vibration, etc., may be
the fault of the equipment powered rather than the
engine itself. Since many varied types of equipment are
powered by Briggs & Stratton engines, it is not possible
to list all of the various conditions that may exist. Listed
are the most common effects of equipment problems,
and what to look for as the most common cause.
Hard Starting or Will Not Start
1. A loose drive belt like a loose blade can cause a
backlash effect, which will counteract engine
cranking effort.
2. Starting under load - see if the unit is disengaged
when engine is started; or if engaged, should not
have a heavy starting load.
3. Check remote control assembly for proper
adjustment.
4. Check interlock system for shorted wires, loose or
corroded connections, or defective modules or
switches.
Engine Won’t Stop
1. Check equipment ignition stop switch.
2. Check for loose or disconnected equipment stop
switch wire.
3. Check engine ground wire harness.
Vibration
1. Cutter blade bent or out of balance.
2. Mounting bolts loose.
CAUTION: Do not crank starter for more than 15
seconds without allowing starter to cool at least 2
minutes or the starter motor could be damaged.
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