Loader Bobcat 853, 853H. Manual - part 7

A

CD–10853

ENGINE COOLING SYSTEM

Checking The Coolant Level

Check the cooling system every day to prevent
over–heating, loss of performance or engine damage.

Open the rear door. Check the coolant level in the coolant
recovery tank on the right side of the engine [A].

The coolant recovery tank must be 1/3 full.

Propylene Glycol

Add premixed coolant, 47% water and 53% propylene
glycol to the recovery tank if the coolant level is low.

One gallon and one pint of propylene glycol mixed with
one gallon of water is the correct mixture of coolant to
provide a –34

°

F (–37

°

C) freeze protection.

Use a refractometer to check the condition of propylene
glycol in your cooling system.

Ethylene Glycol

Add premixed coolant, 50% water and 50% ethylene
glycol to the recovery tank if the coolant level is low.

Cleaning The Cooling System

Raise the rear grill.

Use air pressure or water pressure to clean the top of the
oil cooler [B].

Raise the oil cooler and clean the top of the radiator [C].

Check cooling system for leaks.

NOTE: The loader is factory filled with propylene

glycol coolant. DO NOT mix propylene glycol
with ethylene glycol.

I–2124–0497

Always use the correct ratio of water to anti-
freeze. 

Too much antifreeze reduces cooling system
efficiency  and  may  cause   serious premature
engine damage. 

Too little antifreeze reduces the additives
which protect the internal engine compo-
nents; reduces the boiling point and freeze
protection of the system. 

Always add a premixed solution. Adding full
strength concentrated coolant can cause seri-
ous premature engine damage.

AVOID ENGINE DAMAGE

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Service Manual

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P–00381

ENGINE COOLING SYSTEM (Cont’d)

Replacing The Coolant

Do not remove radiator cap when the engine is
hot. You can be seriously burned.

W–2070–1285

Open the rear door. Open the rear grill.

Remove the radiator cap (Item 1) [A].

Remove the drain plug (Item 1) [B] from the side of the
engine block. Drain the coolant into a container.

After all the coolant is removed, install and tighten the
drain plug.

Mix the coolant in a separate container See
SPECIFICATIONS, Page 9–1 for correct capacity.

Fill the radiator and engine block with the premixed
coolant.

 Install the radiator cap.

Fill the coolant recovery tank 1/3 full.

Run the engine until it is at operating temperature. Stop
the engine. Check the coolant level in the recovery tank
when cool. Add coolant to the recovery tank as needed.

Propylene Glycol

Add premixed coolant; 47% water and 53% propylene
glycol to the recovery tank if the coolant level is low.

One gallon and one pint of propylene glycol mixed with
one gallon of water is the correct mixture of coolant to
provide a –34

°

F (–37

°

C) freeze protection.

I–2124–0497

Always use the correct ratio of water to anti-
freeze. 

Too much antifreeze reduces cooling system
efficiency  and  may  cause   serious premature
engine damage. 

Too little antifreeze reduces the additives
which protect the internal engine compo-
nents; reduces the boiling point and freeze
protection of the system. 

Always add a premixed solution. Adding full
strength concentrated coolant can cause seri-
ous premature engine damage.

AVOID ENGINE DAMAGE

B

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1

A

P–00379

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Service Manual

ALTERNATOR BELT

Adjusting The Alternator Belt

Stop the engine.

Raise the operator cab. (See Page 1–8.)

Loosen the alternator mounting bolt (Item 1) [A].

Loosen the adjustment bolt (Item 2) [A].

Move the alternator until the belt has 5/16 inch (8,0 mm)
movement at the middle of the belt span with 15 lbs. (66
N) of force.

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2

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Service Manual

HYDRAULIC/HYDROSTATIC SYSTEM

Checking And Adding Fluid

Use only recommended fluid in the hydraulic system See
SPECIFICATIONS, Page 9–1 for the correct fluid.

To check the reservoir, use the following procedure:

Put the Bobcat loader on a level surface. Lower the lift
arms and tilt the Bob–Tach fully back.

Stop the engine.

Remove the dipstick [A].

The fluid level must be between the marks on the dipstick.

If fluid is needed, remove the fill cap (Item 1) [B].

Add the fluid as needed to bring the level to the top mark
on the dipstick [A].

Replacing Hydraulic/Hydrostatic Filters

See the SERVICE SCHEDULE, Page 1–3 for the correct
service interval.

Raise the operator cab. (See Page 1–8.)

Use a filter wrench and remove the filter elements (Item
1 & 2) [C].

Clean the surface of the filter housing where the element
seal contacts the housing. Put clean oil on the rubber seal
of the filter element.

Install and hand tighten the filter elements.

NOTE: Before installing the fill cap, make sure the

rubber gasket is installed on the fill cap (Inset
[B].

A

CD–15162

C

CD–10855

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1

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Service Manual

B

CD–15161

CD–15135

1