PDF Operation & Maintenance Manual Bobcat 753 753H Loader - 3 MB
This is the complete Operation and Maintenance Manual for the versatile Bobcat 753 and 753H loaders.
It covers everything from daily safety checks and fluid specifications to routine service intervals and basic adjustments.
By following the procedures in this guide, you can ensure your loader remains reliable and productive for years to come.
This document is essential for any owner or operator.
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--- Page 1 ---
7 7
5 5
3 3 Operation
H &
Maintenance
Dealer Copy -- Not for Resale
Doosan purchased Bobcat Company from Ingersoll-Rand Company in
2007. Any reference to Ingersoll-Rand Company or use of trademarks,
Manual
service marks, logos, or other proprietary identifying marks belonging
to Ingersoll-Rand Company in this manual is historical or nominative
in nature, and is not meant to suggest a current affiliation between
Ingersoll-Rand Company and Bobcat Company or the products of
either.
753 Base S/N 511350883 & Above
753 Plus S/N 511525541 & Above
753H Plus S/N 511011007 & Above
BASE
PLUS
HIGH
HORSEPOWER
EQUIPPED WITH
BOBCAT INTERLOCK
CONTROL SYSTEM (BICSTM)
6722761 (11-98) Revised (6-12) Printed in U.S.A. © Melroe Company 1998
1 of 104
--- Page 3 ---
BOBCAT LOADER IDENTIFICATION (Cont’d)
753H Plus (5110)
FRONT LIGHTS
GRAB OPERATOR SEAT
STEERING HANDLES
LEVER
SEAT BELT
SECONDARY FRONT
AUXILIARY QUICK
COUPLERS
REAR AUXILIARY
TILT CYLINDER QUICK COUPLERS
(Optional)
FRONT AUXILIARY
QUICK COUPLERS
SAFETY TREAD
{BUCKET
BUCKET STEPS
•OPERATOR CAB
SEAT BAR (ROPS & FOPS)
REAR WINDOW
LIFT ARM
REAR GRILL
LIFT ARM
SUPPORT DEVICE
REAR LIGHT
REAR DOOR LIFT CYLINDER
TAIL LIGHT
TIRES* B–12555
B–12556
* TIRES – Flotation tires are shown. The Bobcat loader is base–equipped with standard tires.
BUCKET – Several different buckets and other attachments are available for the Bobcat loader.
ROPS, FOPS – Roll–Over Protective Structure, Falling Object Protective Structure, per SAE J1040 and SAE
J1043. The Bobcat loader is base–equipped with a standard operator cab as shown.
753, 753H Bobcat Loader
vii Operation & Maintenance Manual
--- Page 4 ---
OPERATING INSTRUCTIONS
ATTACHMENTS & BUCKETS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 ...
Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
...
DAILY INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
....
ENGINE SPEED CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5. . .
GETTING READY FOR OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
..
HYDRAULIC CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7. . . OPERATING
Auxiliary Hydraulics Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8. . . INSTRUCTIONS
Bucket Position Valve Operation (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . 7. .
Foot Pedals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
.....
Lift Arm Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7. . . .
Tilt Operation (Bucket) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7. . . .
INSTRUMENT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. . . .
753 Plus (5115) & 753H Plus (5110) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3. .
753 Base (5113) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4. . . .
LIFTING THE LOADER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 ....
Four Point Lift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
....
Single Point Lift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
....
MONITOR SERVICE CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2. . .
OPERATING PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 ...
Backfilling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
.....
Emptying The Bucket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 ....
Digging Into The Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24 ...
Filling The Bucket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 ....
Leveling The Ground (Using Lift Arms In Float Position) . . . . . . . . . . . . . . 24 .
PARKING BRAKE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5. . . .
PARKING THE BOBCAT LOADER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
...
SEAT BAR RESTRAINT SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
...
STARTING THE ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 ...
Normal Starting Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 ...
(753 Plus (5115) & (753H Plus – 5110) . . . . . . . . . . . . . . . . . . . . . . . . . . .15 ..
(753 Base – 5113) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
....
Cold Temperature Starting Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 ..
(753 Plus – 5115) & (753H Plus – 5110) . . . . . . . . . . . . . . . . . . . . . . . . . .16 ..
(753 Base – 5113) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
....
Warming The Hydraulic/Hydrostatic System . . . . . . . . . . . . . . . . . . . . . . . 17 ..
STEERING LEVERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6. . . .
STOPPING THE ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
...
TOWING THE LOADER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
....
TRANSPORTING THE BOBCAT LOADER . . . . . . . . . . . . . . . . . . . . . . . . . 26
..
753, 753H Bobcat Loader
–1– Operation & Maintenance Manual
--- Page 5 ---
DAILY INSPECTION
The loader must be in good operating condition [A].
A
Check the following items:
• Engine Oil
• Hydraulic/Hydrostatic Fluid
• Engine Cooling System
• Operator Cab, Seat Belt, Seat Bar & Pedal Interlocks
• Lift Arm & Cylinder Pivot Pins
• Tires & Tire Pressure
• Any Loose or Broken Parts
• Safety Tread & Safety Signs
• Check the instrument panel display readout for faulty
codes. (See Page 63.)
Follow the maintenance requirements on the Service
Schedule Decal, located inside the rear door [B].
Instructions are necessary before operating or
servicing machine. Read Operation &
Maintenance Manuals, Handbook and signs
(decals) on machine. Follow warnings and
instructions in the manuals when making
repairs, adjustments or servicing. Check for
correct function after adjustments, repairs or
service. Failure to follow instructions can B–06583
cause injury or death [A]. B–06592
W–2003–1289
B
6578218
753, 753H Bobcat Loader
–11– Operation & Maintenance Manual
--- Page 6 ---
ATTACHMENT AND BUCKETS (Cont’d)
A
Installation And Removal
The loader is equipped with the Bob–Tach system. The
Bob–Tach is used for fast changing of buckets and
attachments. See the Attachment Operator ’s Manual to
install other attachments.
Bob–Tach levers have spring tension. Hold
lever tightly and release slowly. Failure to obey P–01563
warning can cause injury.
W–2054–1285
B
Pull the Bob–Tach levers all the way up.
Tilt the Bob–Tach forward. Drive the loader forward until
the top edge of the Bob–Tach is completely under the
flange of the bucket [A].
DO NOT hit the Bob–Tach levers on the bucket.
Tilt the Bob–Tach backward until the bucket is of f the
ground [B]. Stop the engine.
P–01562
AVOID INJURY OR DEATH
C
Before you leave the operator’s seat:
• Lower the lift arms, put the attachment flat on
the ground.
• Stop the engine.
• Engage the parking brake. P–01550
• Raise seat bar, move pedals until both
locked.
W–2045–1086
Push down on the Bob–Tach levers until they are in the
locked position [C].
P–01556
D
Bob–Tach wedges must extend through the
holes in attachment. Lever(s) must be fully
down and locked. Failure to secure wedges can
allow attachment to come off and cause injury
or death.
W–2102–0497
The wedges (Item 1) [D] must extend through the holes
in the bucket or attachment. 1
Removal: Reverse the above procedure to remove the
bucket or attachment from the Bob–Tach. P–01543
753, 753H Bobcat Loader
–21– Operation & Maintenance Manual
--- Page 7 ---
MAINTENANCE SAFETY
Instructions are necessary before operating or servicing machine. Read
Operation & Maintenance Manual, Handbook and signs (decals) on
machine. Follow warnings and instructions in the manuals when making
repairs, adjustments or servicing. Check for correct function after
adjustments, repairs or service. Failure to follow instructions can cause
injury or death. W–2003–0797
Safety Alert Symbol: This symbol with a warning statement, means: “Warning, be alert! Your safety is
involved!” Carefully read the message that follows.
CORRECT CORRECT CORRECT
B–10731 B–12365 B–7469
Never service the Bobcat® Skid Use the correct procedure to lift or Cleaning and maintenance are
Steer Loader without lower operator cab with lift arms required daily.
instructions. down.
WRONG WRONG WRONG
B–11799 B–3724 B–6593
Have good ventilation when Vent exhaust to outside when Never work on loader with lift
welding or grinding painted parts. engine must be run for service. arms up unless lift arms are held
Wear dust mask when grinding Avoid exhaust fume leaks which by an approved lift arm support
painted parts. Toxic dust and gas can kill without warning. Exhaust device. Replace if damaged.
can be produced. system must be tightly sealed. Never modify equipment or add
attachments not approved by
Melroe Company.
WRONG WRONG WRONG
B–6590 B–6580 B–6589
Stop, cool and clean engine of Keep body, jewelry and clothing Lead–acid batteries produce
flammable materials before away from moving parts, flammable and explosive gases.
checking fluids. electrical contacts, hot parts and Keep arcs, sparks, flames and
Never service or adjust loader exhaust. lighted tobacco away from
with the engine running unless Wear eye protection to guard batteries.
instructed to do so in the manual. from battery acid, compressed Batteries contain acid which
Avoid contact with leaking springs, fluids under pressure burns eyes or skin on contact.
hydraulic fluid or diesel fuel and flying debris when engines Wear protective clothing. If acid
under pressure. It can penetrate are running or tools are used. Use contacts body, flush well with
the skin or eyes. eye protection approved for type water. For eye contact flush well
Never fill fuel tank with engine of welding. and get immediate medical
running, while smoking or when Keep rear door closed except for attention.
near open flame. service. Close and latch door
before operating the loader.
Maintenance procedures which are given in the Operation & Maintenance Manual can be performed by
the owner/operator without any specific technical training. Maintenance procedures which are
not in the
Operation & Maintenance Manual must be performed ONLY BY QUALIFIED BOBCAT SERVICE
PERSONNEL. Always use genuine Bobcat replacement parts. MSW01–0698
753, 753H Bobcat Loader
–31– Operation & Maintenance Manual
--- Page 8 ---
FUEL SYSTEM (Cont’d)
A 753 & 753 Base
Removing Air From The Fuel System
1
After replacing the fuel filter element or when the fuel
tank
has run out of fuel, the air mustbe removed from the fuel
system prior to starting the engine.
Diesel fuel or hydraulic fluid under pressure
can penetrate skin or eyes causing serious
injury. Fluid leaks under pressure may not be P–01576
visible. Use a piece of cardboard or wood to
find leaks. Do not use your bare hand. Wear
safety goggles. If fluid enters skin or eyes, get B 753H
immediate medical attention.
W–2074–1285 1
Open the vent (Item 1) [A] & [B] on the fuel filter housing.
Operate the hand pump (priming bulb) until fuel flows
from the vent with no air bubbles [A] & [B].
Close the vent (Item 1)[A] & [B] on the fuel filter housing.
P–01578
Open the vent (Item 1) [C] & [D] on the fuel injection 753 & 753 Base
pump. C
Operate the hand pump (priming bulb) until the pump
feels solid [A] & [B].
Tighten the vent plug [C] & [D]. 1
Start the engine. It may be necessary to open the vent
plug (at the fuel injection pump) briefly until the engine
runs smoothly.
P–01573
D 753H
1
P–01574
753, 753H Bobcat Loader
–41– Operation & Maintenance Manual
--- Page 9 ---
HYDRAULIC/HYDROSTATIC SYSTEM (Cont’d)
Hydraulic Fluid Replacement
A
See the SERVICE SCHEDULE Page 33 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: Check to make sure the rubber gasket is
installed on the fill cap.
1
Raise the operator cab. (See Page 35.)
P–01560
Disconnect the hose from the case drain filter
and plug the
filter and case drain hose [B]. B
Remove the case drain filter and drain the fluid into a
container.
1
Replace the hydraulic/hydrostatic filter element.
Replace both case drain filters (Item 1) [C] & [D] on the
hydrostatic motors.
When all the fluid is removed from the reservoir ,
reconnect the hose to case drain filter on the reservoir.
Add the correct fluid to the reservoir until the fluid level is
between the marks on the dipstick. DO NOT fill above the
P–01499
top mark on the dipstick.
C
1
Hydraulic fluid escaping under pressure can
have sufficient force to enter a person’s body
by penetrating the skin. This can cause serious
injury and possibly death if proper medical
treatment by a physician familiar with this
injury is not received immediately.
W–2145–0290
P–01494
D
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. 1
W–2103–1285
Start the engine and operate the loader hydraulic
controls. Stop the engine. Check for leaks. Check the
fluid
level in the reservoir and add as needed.
P–01530
753, 753H Bobcat Loader
–51– Operation & Maintenance Manual
--- Page 10 ---
SYSTEMS ANALYSIS
SERVICE CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
....
SYSTEMS
ANALYSIS
753 Bobcat Loader
–61– Operation & Maintenance Manual
--- Page 11 ---
5. Sistema hidráulico/hidrostatico (solamente modelos 9. BICS–Vérifiez le fontionnement. Nettoyez la saleté,
400 y 500)–Cambiar el filtro. Nota: El filtro ha de les débris ou les objets se trouvant sous ou derrièr e
cambiarse antes si el inficador de aviso de la le siège selon le besoin.
trasmision permanece encendido mas de 5 minutos 10. Pneus–Vérifiez la pression de gonflage. Gonflez le s
despues de que el fluido hidráulico haya alcanzado pneus à la pression MAXIMUM indiquée sur la paroi
su temperatura de trabajo. latérale des pneus.
CADA 250 HORAS (O CADA 12 MESES) TOUTES LES 50 HEURES
1. Filtro Final del Combustible–Reemplace el elemento 1. Huile hydraulique–Vérifier le niveau d’huile. Consulter
del filtro. le Manuel de l’Opérateur et d’Entretien pour l’huile.
2. Pivotes de la Palanca de la Dirección–Lubriquelos 2. Carter de chaînes–Vérifier le niveau. Consulter l e
con grasa de base de litio para usomúltiple (2 sitios). Manuel de l’Opérateur et d’Entretien pour l’huile.
3. *Correa de transmisión. Comprobar si está desgastada 3. Batterie–Contrôler l’état de la batterie.
o deteriorads. Ajustar si es necesario. 4. Commandes et freins–Contrôler le fontionnement et
*Inspeccione la nueva correa después de transcurridas régler si nécessaire.
las primaras 50 horas de funcionamento. Ajustar si es 5. Huile moteur (sĂ©rie 450 uniquement)–Vidanger Ă
necesario. chaud. Consulter le Manuel de l’Opérateur e t
4. Transmisión (500 solamente)– Engrasar acoplamiento d’Entretien.
universal de la transmisión (modelo 500’ s solamente). TOUTES LES 100 HEURES
Ver tipo de grasa en el Manual de UtilizaciĂłn y de 1. Silencieux para–étincelles–Vider la chambre Ă
Mantenimiento. Ă©tincelles.
5. Sistema hidráulico/hidrostatico–Reemplazar el tapón 2. Circuit d’allumage–Si on utilise de carburant au plomb ,
respiradero del depósito hidráulico y cambiar el vérifier les bougies et l’allumage. Si on utilise d u
elemento del filtro. (853–reemplazar 2 elementos de carburant sans plomb, effectuer l’entretien uniquement
filtro). Nota: El elemento filtrante deve ser cambiado selon besoin afin de maintenir de bonnes performances
antes si el indicador de la transmisión permanece au démarrage et un fonctionnement régulier (moteur
encendido mas de 5 minutos despues de que el fluido Ă esence uniquement).
hidráulico haya alcanzado su temperatura de trabajo. 3. Huile moteur–Vidanger à chaud et changer le filtre.
CADA 1000 HORAS (O CADA 12 MESES) Consulter le Manuel de l’Opérateur et d’Entretien .
1. Depósito hidráulico–Reemplazar el aceite. Véase tipo (Toutes les 250 heures pour les séries 700 équipées
de aceite en el Manual de Utilización y de d’un moteur KUBOTA.)
Mantenimiento. 4. Contrôler tous les entraînements par courroie :
2. Filtro de purge de los motores hidráulicos–Limpiar o hydrostatique, pomps á eau, alternateur et ventilateu r;
cambiar si existen. vérifier l’état et la tension des courroies. Régler o u
3. Cárter de la cadena– Vaciar y reemplazar el aceite. remplacer selon besoin.
Véase tipo de aceite en el Manual de Utilización y de 5. Circuit hydraulique/hydrostatique (séries 400 et 500
Mantenimiento. uniquement)–Reemplacer l’élément du filtre. Remarque:
4. Cárter de engranajes del ventilador–Comprobar el L’élémentde filtre doit être remplacer plus tôt si l e
nivel. Véase tipo de aceite en el Manual deUtilización signal d’avertissement pour la transmission rest e
y de Mantenimiento. allumĂ© plus de 5 minutes après que l’huile ne soit Ă
5. BICS–Comprobar el mando auxiliary de derivaciónde temperáture.
los brazos de elevaciĂłn. TOUTES LES 250 HEURES (OU TOUS LES 12 MOIS)
1. Filtre d’alimentation final–Remplacer l’élément d u
PROGRAMME D’ENTRETIEN (FRENCH) filtre.
2. Pivots des leviers de direction–Lubrifier avec de l a
TOUTES LES 10 HEURES graisse tous usages Ă base de lithium (2 points).
1. Huile moteur–Contrôler le niveau–Nepas dépasser le 3. Courroie de transmission–Vérifier et tendre s i
niveau (consulter le Manuel de l’Opérateur et d’Entretien nécessaire. Vérifier la courroie de remplacement
pour l’huile recommandée). après 50 heures d’utilisation et régler si nécessaire.
2. Filtre à air du moteur–Contrôler la jauge et/ou l’affichage. 4. Transmission (série 500 uniquement)–Graisser le
Entretenir uniquement si nécessaire. cardan. Consulter le Manuel de l’Opérateur et
3. Circuit de refriudussenebt du moteur–Nettoyer les d’Entretien.
débris du refroidisseur d’huile, du radiateur et des 5. Circuit hydraulique/hydrostatique–Remplacer l e
grilles. Contrôler à froid le niveau de liquid de bouchon de reniflard du réservoir hydraulique et
refroidissement et rajouter si nécessaire un mélange remplacer l’élément de filtre (853–remplacer deux (2)
d’éthylène–glycol/eau à 53/47. éléments de filtre). Remarque: L’élément de filtre doit
4. Bras de levage de la chargeuses, vérins, pivots et cale être remplacé plus tôt si le signal d’avertissement de
du Bob–Tach: lubrifier avec de la graisse tous usages transmission reste allumé plus de 5 minutes après que
à base de lithium (12 points). le liquide hydraulicque soit à température.
5. Circuit d’air du moteur–Rechercher les fuites et les
éléments endommagés. TOUTES LES 1000 HEURES (OU TOUS LES 12 MOIS)
6. Généralités–Rechercher les pièces desserrés ou 1. Réservoir hydraulique–Remplacer l’huile. Consulte r
brisées, voir si la ceinture de sécurité est endommagée le Manuel d’Opération et d’Entretien pour l’huil e
de même que la cabine de l’opérateur, contrôler le recommandée.
fonctionnement des instruments, rechercher les écrous 2. Filtre de drain de moteurs de transmission–Nettoyer
de roue desserrés, les fuites d’huile, etc... Vérifier ou remplacer si existant.
l’arceau de sécurité et réparer ou remplacer selon 3. Carter de chaînes–Vidanger l’huile et la remplacer.
besoin avant d’utiliser la chargeuse. Consulter le Manuel de l’Opérateur et d’Entretien pour
7. Ceinture de sécurité/Verrouillages de barre de siège l’huile recommandée.
et de commandes–Fonction de vérification. Réparer 4. Réducteur du ventilateur–Contrôler le niveau d’huile.
ou remplacer selon les besoins. Nettoyer la saleté et Consulter le Manuel de l’Opérateur et d’entretien pou r
les débris. l’huile recommandée.
8. Filtre d’alimentation–Vidanger l’eau de condensation 5. BICS–Vérifier le fonctionnement de la vanne d e
(moteur diesel uniquement). descente du bras de levage.
753, 753H Bobcat Loader
–71– Operation & Maintenance Manual