Test
WARNING
Parts of this procedure require working on the
truck with full electric current present. To prevent
personal injury or property damage, DO NOT wear
a watch, rings, or jewelry while working around
the contactor panel. Whenever manually closing a
contactor with the power connected, use a prop-
erly insulated tool.
1.
Check condition of battery. If it is not fully
charged, recharge or replace battery with a
fully charged battery before continuing.
2.
Raise drive wheel of truck so it is clear of the
floor. Block chassis in this position and remove
lifting device.
3.
Visually check to see if contactor closes when
circuit is energized. If contactor closes, proceed
to Step 5. If contactor does not close, proceed to
Step 4.
4.
Check for battery voltage at contactor coil.
No voltage: Open circuit in control circuit
wiring to contactor.
Low voltage: High resistance in control
circuit wiring to contactor.
Full battery voltage: No problem with
control circuit. Problem is probably in
contactor. Proceed with test.
5.
Check at the contactor for loose, broken, or cor-
roded connections.
6.
Visually check the condition of the tips for pit-
ting, burning, or wear.
7.
Check ohm value of contactor coil. Disconnect
leads from one side of the coil and connect an
ohmmeter across coil. Reverse ohmmeter leads
and check in the opposite polarity (since spike
suppressors on some coils make them polarity
sensitive). Compare ohm reading against ohm
value for the type contactor. Use the highest
rating. See Table 2.
Table 2. Coil Resistance
Device
Location
24v Coil
Resistanc
e @ 21°C
(70°F)
Notes
Truck main
contactor
Contactor
panel
32 ohms ± 3
ohms
Test coil
both ways.
Use highest
reading.
Coil
(Hydraulic
control)
On pump
assembly
40 ohms ± 4
ohms
Test coil
both ways.
Use highest
reading.
Brake coil
On top of
drive motor
12 ohms ± 1
ohm
Tips
When replacing tips, make sure the new tips have
the same ampere carrying capacity and are direct
replacements for the original tips.
A high-voltage drop (2 volts or more) across the tips
indicates poor contact or high resistance. Check for
burned or worn tips, incorrect size or mismatched
tips, and proper gap settings when open.
Disassemble and Assemble
WARNING
Disconnect the battery and separate the connec-
tor before opening the drive unit and compart-
ment and inspecting or repairing the electrical
system. If a tool causes a short circuit, the high-
current flow from the battery can cause a per-
sonal injury or property damage.
NOTE:
If both the contacts and coil of a contactor
will be replaced, replace the complete contactor as
described in Replacing the Contactor. Do only the
parts of the procedure necessary to replace the de-
fective parts being replaced.
NOTE:
All of the contacts for each contactor must
be replaced at the same time if any contact requires
replacement.
2200 SRM 1612
Contactor and Electrical Panel Checks
17
Содержание D264
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