Loader Bobcat 853, 853H. Manual - part 49

BATTERY (Cont’d)

Removal And Installation (Cont’d)

Always clean the terminals and cable ends when
installing a new battery [A] and [B].

When installing the battery in the loader, do not touch any
metal parts with the battery terminal posts.

Connect and tighten the battery cables. Connect the
negative (–) cable last to prevent sparks.

W–2065–1296

Batteries contain acid which burns eyes and
skin on contact. Wear goggles, protective
clothing and rubber gloves to keep acid off
body.

In case of acid contact, wash immediately with
water. In case of eye contact get prompt medical
attention and wash eye with clean, cool water
for at least 15 minutes.

If electrolyte is taken internally drink large
quantities of water or milk. DO NOT induce
vomiting. Get prompt medical attention.

Servicing The Electrical System

The battery cables must be clean and the connections
tight. Remove acid or corrosion from the battery and
cables with a sodium bicarbonate (baking soda) and
water solution [C].

Clean the terminals and cable ends as shown in Fig. [A]
and [B].

Check the electrolyte level in the battery. Add distilled
water as needed.

Put Battery Saver (P/N 6664458) or grease on the battery
terminals and cable ends to prevent corrosion.

P–09589

P–09588

–6–8–

853, 853H Loader

Service Manual

P–09590

BATTERY (Cont’d)

Using A Booster Battery (Jump Starting)

If it is necessary to use a booster battery to start the
engine, BE CAREFUL! There must be one person in the
operator’s seat and one person to connect and
disconnect the battery cables.

The ignition must be in the OFF position. The booster
battery to be used must be 12 volt.

Connect the end of the first cable (Item 1) [A] to the
positive (+) terminal of the booster battery. Connect the
other end of the same cable (Item 2) [A] to the positive
terminal on the starter solenoid.

Connect the end of the second cable (Item 3) [A] to the
negative (–) terminal of the booster battery. Connect the
other end of the same cable (Item 4) [A] to the engine.

Keep cables away from moving parts. Start the engine.
(Also see Cold Temperature Starting Condition,
Operation & Maintenance Manual.)

After the engine has started, remove the ground (–) cable
(Item 4) [A] first. Remove the cable from the positive
terminal on the starter solenoid.

W–2065–1296

Batteries contain acid which burns eyes and
skin on contact. Wear goggles, protective
clothing and rubber gloves to keep acid off
body.

In case of acid contact, wash immediately with
water. In case of eye contact get prompt medical
attention and wash eye with clean, cool water
for at least 15 minutes.

If electrolyte is taken internally drink large
quantities of water or milk. DO NOT induce
vomiting. Get prompt medical attention.

Keep arcs, sparks, flames and lighted tobacco

away from batteries. When jumping from

booster battery make final connection

(negative) at engine frame.

Do not jump start or charge a frozen or damaged

battery. Warm battery to 60

F. (16

C.) before

connecting to a charger. Unplug charger before

connecting or disconnecting cables to battery.

Never lean over battery while boosting, testing

or charging.

Battery gas can explode and cause serious

injury.

W–2066–1296

Damage to the alternator can occur if:

I–2023–1285

•

Engine is operated with battery cables
disconnected.

•

Battery cables are connected when using a
fast charger or when welding on the loader.
(Remove both cables from the battery.)

•

Extra battery cables (booster cables) are
connected wrong.

CD–15009

CD–15010

853, 853H Loader

–6–9–

Service Manual

ALTERNATOR

Alternator Output Test

Put jackstands under the front axles and rear
corners of the frame before running the engine
for service. Failure to use jackstands can allow
the machine to fall or move and cause injury or
death.

W–2017–0286

Lift and block the loader (See Page 1–1).

Disconnect the negative (–) cable from the battery.

Disconnect the red wire (Item 1) [A] from the alternator.
Connect the wire to the negative (–) side of the ammeter.

Connect the positive (+) side of the ammeter to the output
terminal on the alternator (Item 1) [A].

Disconnect the fuel stop solenoid connector.

Connect the negative (–) cable to the battery.

Turn on the lights and crank the engine for 30 seconds to
discharge the battery.

Connect the fuel stop solenoid, start the engine and run
at 2600 RPM.

If ammeter reading is between 45–55 amps. @ 2600
RPM the alternator is good and no further testing is
needed.

If the reading is low, remove the screws and pull the
regulator cover away from the alternator and continue
testing (below).

Rectifier (Diode) Test

Disconnect the negative (–) cable from the battery.

Install the wire in their original location on the back of the
alternator.

Connect a jumper wire (Item 1) [B] to the alternator output
terminal and the regulator terminal.

Connect the battery negative (–) cable.

Start the engine and run at 2600 RPM.

If the reading is within 45–55 amps. @ 2600 RPM replace
the rectifier (diode) assembly or replace the alternator.

If the reading is low, do the Alternator Regulator Test.

NOTE: The alternator is removed from the loader for

clarity purposes.

P–4944

P–1304

Output

Terminal

Regulator

Terminal

–6–10–

853, 853H Loader

Service Manual

When an engine is running in an enclosed
area, fresh air must be added to avoid
concentration of exhaust fumes. If the engine
is stationary, vent the exhaust outside.
Exhaust fumes contain odorless, invisible
gases which can kill without warning.

ALTERNATOR (Cont’d)

Alternator Regulator Test

W–2050–1285

Connect the positive (+) voltmeter lead to the positive (+)
battery terminal [A].

Connect the negative (–) voltmeter lead to the negative
(–) battery terminal [A].

Start the engine and run at 1500–2000 RPM.

The voltmeter should read between 13.9–14.7 volts.

If the reading is low, stop the engine and disconnect the
battery negative (–) cable.

Remove the wires from the back of the alternator.

Remove the regulator cover from the back of the
alternator.

Install the wires on the back of the alternator.

Connect a jumper wire (Item 1) [B] from the brush
terminal to the ground stud.

Connect the negative (–) battery cable and start the
engine. Run at 1500 RPM.

If the voltmeter reading is 14.5 or above, replace the
regulator.

If the voltmeter reading is below 14.5, repair or replace the
alternator.

NOTE: The alternator is removed from the loader for

clarity purposes.

P–05054

853, 853H Loader

–6–11–

Service Manual

P–01364

Ground

Stud

Brush

Terminal

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