Loader Bobcat 853, 853H. Manual - part 8

Remove the screen (Item 1) [B] and thoroughly clean with
clean solvent.

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

HYDRAULIC/HYDROSTATIC SYSTEM (Cont’d)

Replacing The Hydraulic Fluid

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

The fluid must also be replaced if it becomes
contaminated or after major repairs.

Remove the reservoir fill cap (Item 1) [A].

NOTE: Before installing the fill cap, make sure the

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

NOTE: Case drain filters are added to later model

loaders listed below:

S/N 510125001 & Above
S/N 510250001 & Above
S/N 510374001 & Above

Remove the two case drain filters (Item 1) [C] &[D] (one
for each hydrostatic motor) and clean thoroughly or
replace filters.

When all the fluid is removed from the reservoir, connect
and tighten the filters and case drain hoses.

Add the correct fluid to the reservoir until the fluid level is
between the marks on the dipstick. DO NOT fill above the
top mark on the dipstick.

Lower the operator cab. Start the engine and operate the
loader hydraulic controls.

Lower the lift arms. Stop the engine. Check for leaks.
Check the fluid level in the reservoir and add as needed.

Always clean up spilled fuel or oil. Keep heat,
flames, sparks or lighted tobacco away from
fuel and oil. Failure to use care around
combustibles can cause explosion or fire
which can result in injury or death.

W–2103–1285

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CD–15161

CD–15135

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C

P–00971

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D

P–00969

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HYDRAULIC/HYDROSTATIC SYSTEM (Cont’d)

Hydraulic Reservoir Breather Cap

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

Remove the breather cap [A].

NOTE:  Make sure the rubber gasket is installed on

the breather cap (Inset) [A].

Make sure the baffle washer is installed in the hydraulic
reservoir [B].

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CD–15132

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CD–15133

SPARK ARRESTOR MUFFLER

Cleaning Procedure

See the SERVICE SCHEDULE, Page 1–3 for service
interval for cleaning the spark arrestor muffler.

Do not operate the loader with a defective exhaust
system.

Stop the engine. Open the rear door and rear grill.

Remove the plug (Item 1) [A] from the bottom of the
muffler.

When the engine is running during service, the
steering levers must be in neutral and the
parking brake engaged. Failure to do so can
cause injury or death.

W–2006–0284

Start the engine and run for about 10 seconds while a
second person, wearing safety glasses, holds a piece of
wood over the outlet of the muffler.

Stop the engine. Put anti–seize coating on plug. Install
and tighten the plug. Lower the rear grill and close the rear
door.

This loader is factory equipped with a U.S.D.A.
Forestry Service approved spark arrestor
muffler. It is necessary to do maintenance on
this spark arrestor muffler to keep it in working
condition.  The spark arrestor muffler must be
serviced by dumping the spark chamber every
100 hours of operation.

If this machine is operated on flammable forest,
brush or grass covered land, it must be
equipped with a spark arrestor attached to the
exhaust system and maintained in working
order. Failure to do so will be in violation of
California State Law, Section 4442 PRC.

Make reference to local laws and regulations for
spark arrestor requirements.

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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.

W–2050–1285

Stop engine and allow the muffler to cool before
cleaning the spark chamber. Wear safety
glasses or goggles. Failure to obey can cause
serious injury.

W–2011–1285

Never use machine in atmosphere with
explosive dust or gases or where exhaust can
contact flammable material. Failure to obey
warnings can cause injury or death.

W–2068–1285

TIRE MAINTENANCE

Wheel Nuts

See the SERVICE SCHEDULE, Page 1–3 for the service
interval to check the wheel nuts. The correct torque is
105–115 ft.–lbs. (142–156 Nm) torque [A].

Tire Rotation

Check the tires regularly for wear, damage and pressure
See  SPECIFICATIONS Page 9–1 for the correct tire
pressure.

Rear tires usually wear faster than front tires. To keep tire
wear even, move the front tires to the rear and rear tires
to the front [B].

It is important to keep the same size tires on each side of
the loader. If different sizes are used, each tire will be
turning at a different rate and cause excessive wear. The
tread bars of all the tires must face the same direction.

Recommended tire pressure must be maintained to avoid
excessive tire wear and loss of stability and handling
capability. Check for the correct pressure before
operating the loader.

Tire Mounting

Tires are to be repaired only by an authorized person
using the proper procedures and safety equipment. Tires
and rims must always be checked for correct size before
mounting. Check rim and tire bead for damage.

The rim flange must be cleaned and free of rust. The tire
bead and rim flange must be lubricated with a rubber
lubricant before mounting the tire, avoid excessive
pressure which can rupture the tire and cause serious
injury or death. During inflation of the tire, check the tire
pressure frequently to avoid over inflation.

Do not inflate tires above specified pressure.
Failure to use correct tire mounting procedure
can cause an explosion which can result in
injury or death.

W–2078–1285

Inflate tires to the MAXIMUM pressure shown
on the sidewall of the tire. DO NOT mix brands
of tires used on the same loader.

I–2057–0794

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B–09976