Liebherr Tractor PR 721C Operation & Maintenance Manual – PDF DOWNLOAD

Description

Liebherr Tractor PR 721C Operation & Maintenance Manual – PDF DOWNLOAD

FILE DETAILS:

Liebherr Tractor PR 721C Operation & Maintenance Manual – PDF DOWNLOAD

Language : English
Pages : 72
Downloadable : Yes
File Type : PDF
Size: 5.51 MB

DESCRIPTION:

Liebherr Tractor PR 721C Operation & Maintenance Manual – PDF DOWNLOAD

FOREWORD:

This manual is primarily for the operator and the maintenance crew and contains information which is vital to the correct and secure operation and proper maintenance of the LIEBHERR PR Crawler Dozer.

• If you follow these instructions, your LIEBHERR PR 721 Crawler Dozer will give you constant and reliable service with excellent performance. This manual should be given to the operator, who should read it carefully before operating the Crawler Dozer and thereafter at regular intervals.
• Please take notice that we cannot honor any claim which could arise due to careless handling, improper operation, or inadequate maintenance.

1 MACHINE DESCRIPTION:

The PR 721 C is a crawler dozer with hydrostatic drive, easy and comfortable to operate and fast
and easy to maintain. ·
1.1 DIESEL ENGINE:
The machine is powered by a front mounted, water cooled LIEBHERR – Diesel engine. Easy to
reach maintenance items include cyclone precleaner, two stage dry air filter with vacuum
indicator, radiator, engine oil dip stick, oil filter, fuel filter, and fuel filter/water separator.
1.2 SPLITTER BOX:
The splitter box, together with a centaflex coupling, connects the Diesel engine to the hydraulic
system. Maintenance of the splitter box is limited to a daily visual oil level and leakage check, as
well as scheduled oil changes. The drain plug is equipped with a check valve to make the oil
change easier.
1.3 HYDRAULIC SYSTEM:

• The travel hydraulic system includes a fully hydrostatic drive with closed loop circuit.
  Each side (track} has its own independent circuit, whose main components consist of a variable
  displacement piston pump in swash plate design with integrated replenishing gear, pump and
  filter, and a variable flow axial piston motor.
• All travel movements of the machine are hydraulically controlled with the single lever of a servo
  control valve. The movements go from normal forward or reverse to counter rotation. This type
  of travel system insures infinitely variable travel speed in all directions. The servo circuit with its
  single lever control and engine speed sensing horsepower control (S~HC} valve, insures utilization
  ofthe available horsepower at all times.
• The working hydraulic system consists of a fixed flow gear pump, a servo operated control valve
  in an open loop circuit, as well as hand operated pilot (servo) valves for the various attachment
  functions.
• The daily maintenance of the hydraulic system consists of visual oil level and leakage checks and
  checking the hydraulic oil cooler, mounted side by side to the radiator, for cleanliness. Other
  maintenance items such as hydraulic oi I filters are easily accessible.

IMAGES PREVIEW OF THE MANUAL:

TABLE OF CONTENTS:

Liebherr Tractor PR 721C Operation & Maintenance Manual – PDF DOWNLOAD

INTRODUCTION
1 MACHINE DESCRIPTION 1
1 1 Diesel Engine
1 2 Splitter Box
1 3 Hydraulic System
1 4 Main Frame, Steel Structure, Covers 1
1 5 Undercarriage 2
1 6 Operator’s Platform, Cab and Canopy 2
1 7 Attachments 3
2 TECHNICAL DATA PR 721 C 5
Dimensions- Basic Machine 5
3 TRANSPORT DIMENSIONS AND WEIGHTS 6-7
3 1 Basic Machine 6
3 2 Operator’s Cab 6
3 3 Canopy 6
3 4 Track Guard (1 piece) 6
3 5 Straight Blade 6
3 5 1 Push Arm – left with Hydr Ti It Cylinder and Brace 6
3 5 2 Push Arm – right with Braces 6
3 6 Angle Blade w Braces 7
3 6 1 “C” Frame 7
3 7 Power Angle and Tilt Blade 7
3 7 1 “C” Frame with Adaptor Plate 7
3 8 Multi Shank Ripper 7
3 9 Winch 7
3 10 Swinging Drawbar 7
3 11 Counterweight 7
4 GENERAL TECHNICAL DATA 8-10
4 1 Engine Installation 8
4 1 1 Engine Data 8
4 1 2 Air Cleaner 8
4 1 3 Coupling – Engine to Splitter box 8
4 1 4 Cooling System/Capacity 8
4 1 5 Fuel System/ Capacity 8
4 1 6 Splitter box/Capacity 8
4 2 Hydraulic System 8
4 2 1 Closed Loop Hydrostatic Drive 8
4 2 2 Attachment Hydraulics 8
4 2 3 Control Valve 8
4 2 4 Pilot (servo) Control Valve 8
4 2 5 Servo Pump 9
-1-
Ill! Ill Ml I ‘!·1 I 1111
4 2 6 Hydraulic Tank 9
4 2 7 Hydraulic Oil Cooler 9
4 2 8 Hydraulic Oil Filters 9
4 3 Undercarriage 9
4 3 1 Travel Drive 9
4 4 Electrical System 10
4 5 Cab Heater/Fresh Air 10
4 6 Attachments 10
4 6 1 Blade Lift Cylinder 10
4 6 2 Blade Tilt Cylinder(Straight Blade} 10
4 6 3 Ripper Cylinder 10
4 6 4 Blade Tilt Cylinder (Angle Blade} 10
5 CAPACITIES 11
6 V-BELTS 11
7 COLD START DEVICE 11
8 FILTER ELEMENTS/0-RINGS 12
8 1 EngineFilters 12
8 2 Hydraulic Filters 12
8 3 Cab Filters 12
8 4 O-Rings 12
9 SAFETY INFORMATION 13
9 1 Accident Prevention 13
9 2 General Safety Information 14
9 3 Crushing and Burn Prevention 15
9 4 Fire and Explosion Prevention 16
9 5 Machine Start-up Safety 16
9 6 Engine Start-up and Operation Safety 17
9 7 Machine Operating Safety 17
9 8 Machine Towing and Pulling Safety 18
9 9 Machine Parking Safety 19
9 10 Machine Transportation Safety 19 10 BEFORE STARTING THE ENGINE 20
10 1 Check Engine Oil Level 20
10 2 Check Coolant Level 20
10 3 Check Electrical System/Battery 20
10 4 Check Fuel System/ Fuel Level 21
10 5 Check Air FilterNacuum Indicator 21
10 6 Check Hydraulic Oil Level 21
1 0 7 Check Splitter Box Oi I Level 21
11 1 Operator’s Cab 22
11 2 Operator’s Seat 24
11 3 Cab Heater/Fresh Air 24
OPERATION 25
Start-up Procedures 25
Start-up Procedures 25
Starting the Engine with Flame Glow Plug 26
Low Idle Automatic – Ecomat 26
Stopping/Parking the Machine 26
Travel Functions 27
Straight Travel 27
Counter Rotation 27
Turning left/right in forward or reverse 27
Turning – Power Turn 28
Brake Operation 28
Hi/Low Travel Speed Selector 28
Towing 28
Attachment Operation 29
Blade – Raise/Lower 29
Blade – Float Position 29
Hydraulic Blade Tilt (Straight and Angle Blade) 30
Blade Pitch Adjustment (Straight Blade) 30
Manual Adjustment of Angle Blade 30
Manual Tilt Adjustment of Angle Blade 30
Power Angle and Ti It Blade – Operate blade angle 31
Power Angle and Tilt Blade- Operate blade tilt 31
Ripper Attachment Operation 31
Tilting the Cab/Canopy 32
Raise (tilt) Cab 32
Lower Cab 32
MAINTENANCE 33
Diesel Engine 33
Engine Air Intake System 33
Servicing the Air Cleaner 33
Dry Cleaning 34
Wet Cleaning 34
Primary Element Inspection 35
Primary Element Installation 35
Inspection of the Air Intake and Pre-Cleaner 35
Fuel Tank/Hydraulic Tank 36
Fuel Filter/Water Separator 36
Hydraulic System 36
Check and Clean the Magnetic Rod 37
Replace Hydr Tank Filter 37
Replace Servo Oil Filter 37
Replace Replenishing Oil (Spin on) and In Line Filters on the Travel Pumps 37
Splitterbox 37
Hydraulic System Maintenance and Repair 38
Hydraulic Cylinders 38
Travel Gear 39
Travel Gear Maintenance 39
Travel Gear Parking Brake 39
Track Components 40
To Tighten Track Tension 40
To Release Track Tension 40
Check Tightness of Track Pads and Sprocket Segments 41
Check and Adjust the Idler Guides 41
Cleaning the Track Components 41
Replace Track Chain 42
Remove Sealed Track Chain 42
Install Sealed Track Chain 42-43
Remove SALT Chain 43
Install SALT Chain 44
Electrical System 45
Battery Maintenance 45
To Replace Fuses 45
· Heatingand Fresh Air System 46
Attachments 46
Cutting Edges and Corner Shanks 46
Blade Mounting, Push Arms and Braces 46-47
Ripper Shanks and Teeth 47
Replacement of Wear and Tear Items 47
Piston Rod Preservation 48
14 MAINTENANCE GUIDELINES 49
14 1 Daily 49
14 2 Every 250 Operating Hours 50-51
14 3 Every 500 Operating Hours 51-52
14 4 Every 2000 Operating Hours 52
14 5 Lubrication Chart 53
14 6 Lubrication Points 54
15 TORQUE CHART 55-60
16 ELECTRICAL SCHEMATIC 61-63

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PLEASE NOTE:

• This is not a physical manual but a digital manual – meaning no physical copy will be couriered to you. The manual can be yours in the next 2 mins as once you make the payment, you will be directed to the download page IMMEDIATELY.
• This is the same manual used by the dealers inorder to diagnose your vehicle of its faults.
• Require some other service manual or have any queries: please WRITE to us at [email protected]

S.V