Case 50 Crawler D Series User manual

50 Crawler Series D
Service Manual
S 406236M2
IReprinted I

Find manuals at https://best-manuals.com

GENERAL
TABLE OF CONTENTS
GENERAL
Safety Precautions ................................................................... 3,4
Introduction .......................................................................... 5
Nomenclatureand General Description
.................................................. 6,7
Specifications ........................................................................ 8
SECTION 1 • SCHEDULED PREVENTIVE MAINTENANCE
Introduction .......................................................................... 9
Hydraulic Oil Recommendations
........................................................ 10
Hydraulic System Operating Pressures .................................................. 10
Component Capacities ................................................................ 11
Rated Pump Output ............................... · .................................... 11
Maintenance Chart ................................................................. 12, 13
Illustrated Listing of Grease Fittings .................................................. 14,15
Itemized Maintenance
Instructions ................................................ 16 thru 21
SECTION 2 · MECHANICAL SYSTEM
Undercarriage ......................... : ....................................... 22 thru 30
Engine and Related Parts ................................... : .................... 31 thru 34
Turntable Swing .............. , ....................... ; ....... , .......... , ...... 34 thru 39
aoom and Attachments ........................................ : ................ 39 thru 42
SECTION 3 • ELECTRICAL SYSTEM
Introduction ,; ........................................................................ 43
12/24 Volt System (Machines through PIN 6280344) ... , .............................. 44 thru 52
24 Volt System (Machines with PIN 6280345 and After) ................................ 53 thru 60
Control Circuits ... · ................................................................... 61
Lights and Instrumentation Circuits ..................................................... 62
SECTION 4 · HYDRAULIC SYSTEM (For pressures, see page 10)
Introduction ......................................................................... 63
System Maintenance ........................................................... 64 thru 66
Main Hydraulic System .......................................................... 66 thru 80
General Description ................................................................. 66
Hydraulic Pump .................................................................... 68
Main Control Valves ................................................................. 70
Port Relief Valves ................................................................... 73
Explanation of "Summated" System ................................................... 76
Power Sensing Valve .............................................................. 76
Main Relief Valves ................................................................ 78
Track Drive Hydraulics .......................................................... 81 thru 87
Drive Motor Circuits ................................................................. 81
Digging Brake Release Circuit ........................................................ 85
Solenoid Control Valve .............................................................. 85
Hydraulic Swivel
................................................................... 86
Swing Hydraulics
..................................................................... 88
Hoist Hydraulics ..................................................................... 90
Hydraulic Circuits to Crowd Cylinderand Tool Cylinder ..................................... 92
Leveler Hydraulics .................................................................... 93
PilotControl System ............................................................ 94 thru 97
1
Find manuals at https://best-manuals.com

GENERAL
TABLE OF CONTENTS (CON'T)
SECTION 5 - TROUBLESHOOTING
Introduction ......................................................................... 98
Engine
............................................................................. 100
Undercarriage
....................................................................... 100
Electrical System .................................................................... 102
Pilot Control System ................................................................. 107
Main
Hydraulic System ............................................................... 107
Track Drive System
.................................................................. 109
Swing System ....................................................................... 110
Cylinder Circuits .................................................................... 111
Main Pump ......................................................................... 112
Main
Control Valves .................................................................. 113
Relief Valves
........................................................................ 114
SECTION 6 - DISASSEMBLY AND REPAIR
General Cleaning Instructions ......................................................... 115
leveler Assembly .................................................................... 116
Track Chain
......................................................................... 117
Track
Adjustment Cylinder ............................................................ 118
Track Rollers
........................................................................ 119
Idler Wheel ........................................................................ . 121
Digging Brake ....................................................................... 123
Final Drive
Transmission ........... · .................................................. 125
Engine and Pump Drive
............................................................... 131
House Brake ........................................................................ 133
Swing Gearbox .................................................................. , ... 135
Turntable Bearing Replacement
........................................................ 143
Boom
.............................................................................. 149
Wiring Harness Replacement .......................................................... 150
Main
Hydraulic Pump ................................................................ 150
Pilot Hydraulic Pump ................................................................. 159
Main
Control Valves ................................................................... 160
Power
Sensing Valve ................................................................. 165
Pilot
Control (Modulator) Valves ........................................................ 166
Track Drive
Motor .................................................................... 172
Swing Motor ........................................................................ 180
Swing Cushion Valve ................................................................. 191
Leveler Lock Valve ................................................................... 192
Hydraulic Swivel .................................................................... 194
Hydraulic Cylinders .................................................................. 197
Hydraulic Oil Tank .................................................................. .202
Solenoid Control Valve ............................................................... 203
TORQUE CHARTS AND SCHEMATICS ................................................. 204 thru 208
2
Find manuals at https://best-manuals.com

A SAFETY
THIS SAFETY
ALERT
SYMBOL INDICATES
IMPORTANT SAFETY MESSAGES
IN
THIS
MANUAL, WHEN
YOU SEE THIS
SYMBOL,
CAREFULLY
READ
THE
MESSAGE THAT
FOLLOWS
AND
BE
ALERT TO THE
POSSIBILITY OF PERSONAL INJURY
OR
DEATH.
WARNING:
Always use a non-flammable
A
solvent for cleaning parts.
DO
NOT use
~
gasoline
or
other
flammable
substances.
Whenever
servicing
the machine,
A
always ta§ mark the ignition switch to
~
alert
other
operators
and prevent
accidental start-ups.
A
WARNING:
To help prevent eye injury,
wear eye protection when servicing this
machine.
A
CAUTION:
When checking coolant level,
remove cap on radiator slowly to relieve
pressure within the system.
CAUTION:
Disconnect both leads from
A the
batteries
when
working
on
the
engine
or
electrical
system.
Always
disconnect the Ground lead first.
WARNING:
Use
extreme
care
when
A handling the track. Never insert fingers
between track shoes when removing
track.
GENERAL
A
DANGER:
Exhaust
fumes
can
kill.
If
necessary
to
start
engine
in
an
enclosed
area, be sure
to
provide
adequate ventilation.
A
CAUTION:
ENGINE FAN AND BELTS ·
To prevent possible serious injury avoid
contact with rotating fan and belts.
A
DO
NOT wear loose clothing which may
~
catch in moving parts.
3
Find manuals at https://best-manuals.com

GENERAL
'4
CAUTION:
The
idler
wheel
spring
is
A
under
tension.
If
for
any reason
this
~
spring
must
be removed, use EXTREME
caution.
I
A
WARNING:
To
avoid personal
injury,
keep hands clear
of
turntable
ring gear
w,hile
turntable
is
being rotated.
Keep a fire extinguisher on hand and
A
KNOW
HOW
TO USE IT. Check
it
regul~rly to ensure
it
is in good working
order.
A
WARNING:
Any changes to the
controls
must be clearly noted and posted in the
Operator's Cab.
If
any
control
changes
are made, a new
Operator's
Control
Pattern decal
must
be installed in the
cab
to
warn
other
operators
of
the
changes.
A
Wipe oil spills, immediately and keep
work
area as
clean
as
possible.
A
cluttered work area invites accidents.
A
A
WA
RN
I
NG:
Never operate the
alternator
on
an
open
circuit.
With
no
battery
or
other electrical load on the
circuit,
a
voltage
buildup
will
occur
within
the
alternator. This voltage
buildup
could
be
extremely dangerous
to
anyone
touching
the alternator
"BAT"
terminal.
CAUTION:
When releasing grease from
the track
adjustment
cylinder, loosen
the
adapter
SLOWLY. Very
high
pressure can
exist
in the
adjustment
cylinder
when
under
tension.
The
adapter
fitting
could fly loose and cause
personal injury.
When
bleeding
brakes,
loosen
bleeder
A
plug
approximately
one-half
to
three-
quarter
turn
or
until
oil
just
starts
to
flow.
If
plug
is
loosened
too
far,
it
may
be
blown
out
under
pressure.
A
CAUTION:
Engage Digging Brake
whenever the
unit
is
not
"crawling."
Accidental engagement
of
the Drive
Lock
Switch
will
cause
the machine
to
immediately
move in the
forward
direction.
A
Never smoke
while
refueling, servicing
the
fuel
system
or
working
with
batteries.
Find manuals at https://best-manuals.com

GENERAL
GENERAL INFORMATION
INTRODUCTION
This manual provides instructions for maintenance
and service
of the DROTT 50 series "D" Crawler. All
components and systems are included, with the
exception
of the engine which is covered in the
engine manufacturer's manual supplied with each
machine.
The manual is divided into six sections, preceded by
a general section on safety, machine description and
specifications.
A separate section entitled "Scheduled Preventive
Maintenance" is provided to cover all components
which require periodic maintenance. Refer
to this
section whenever performing normal maintenance.
It
includes a Maintenance Schedule, Component
Capacities, Hydraulic System Operating Pressures,
MaintenanceChart and Maintenance Details.
The Service section is divided
into three general
areas -
Mechanical, Electrical and Hydraulic.
Included in the Service section is general descriptive
and
operational information to provide a basic
understanding of each system and its components.
All disassembly and repair information is contained
in the last section
of the manual and arranged in the
general sequence established in the service section,
i.e. Mechanical, Electrical and Hydraulic.
Troubleshooting charts for all the systems are
contained in a separate section (See Section
5).
Torque Charts and Schematic Drawings of the
Electrical and Hydraulic systems are located in back
of this manual for easy reference when
troubleshooting the machine.
If further service information is required, contact
your nearest DROTT dealer or Service
Representative forassistance.
EXPLANATION OF INTERNATIONAL SYMBOLS
Symbols are a universal language. International
symbols are used in
this manual to help identify
components requiring service.
PARTS AND SERVICE
When writing to the dealer or manufacturer about
your DROTT machine, always give reference to the
model and
PIN (Product Identification Number) in
addition to the part name and location. The
PIN plate
is on the lower right corner
of the cab (Figure 1).
All main components of the machine have an
identification plate or number on the component
housing. The location
of the engine serial plate is
shown in Figure
2.
PRODUCTIDENTIFICATION Al
NUMBER PLATE
~=====[___===== ... -~
Figure 1. Machine Identification
- ~·'€'---
. J cg
.
11
1
~CASE
rr~,----- ENGINE TROIT DIESEL
---
- ---~-
~--
~~
Figure 2. Engine Serial Plate
EQ]
rll
♦
(f)
GIAR BOK
HYQt,h111l 1(
HYDRAULIC
NI ",f MVOUI
FILTER
FIL TIii AUi
9 © JI)
....--...
0
COOI.Afllf
IIIIGIIII OIL
OIISIL fUIL
LUBRICATE•••"
MwlhpurlhJkG•,.••
5
Find manuals at https://best-manuals.com

GENERAL
NOMENCLATURE
I
~
6
1.
Backhoe Bucket {Tool)
2.
Tool Link
3.
Side Levers
4.
Tool Cylinder ·
5.
Dipperstick
6.
Crowd Cylinder
7.
Main Boom
8.
Hoist
Cylinder
9.
Operator's Cab w/Controls
10.
Location
of
Main Control Valves
and Hydraulic Oil Tank
8
NOTE: Machine shown
in
Digging
Position (front of turntable over
rear
of
undercarriage).
'II/A
·•
®-t~~~~~·=;;;:;:::::l.
Figure
3.
Nomenclature
11.
Engine Compartment and Location
of
Hydraulic Pumps
12.
Counterweight
13.
Idler
Wheel
14.
Location
of
Track Adjuster
Cylinder
15.
Leveler Assembly (Optional)
16.
Turntable Bearing
17.
Final Drive Transmission
18.
Location
of
Fuel Tank and
Swing Mechanism
Find manuals at https://best-manuals.com

GENERAL
DIRECTIONAL REFERENCE
The turntable on this machine rotates through a full
360 degrees. The normal
driving posi.tion is with the
Boom over the front of the undercarriage (track drive
transmission to the rear), as shown in figureA. In this
position, directional callouts for both the turntable
and the undercarriageare the same. All references to
Front, Rear, Right and Left will be made with respect
to this position. RIGHT is the Operator's right; LEFT
is the
Operator's left.
~I
V
E
L
LEFT m FRONT
RIGHT I"".~
IDLER
REAR
!UNDERCARRIAGE)
OPERATOR
SI TS
HERE
LEFT RIGHT
{TURNTABLE)
Figure 4. Directional Referer:ce
GENERAL DESCRIPTION
FRONT
REAR
The Drott 50 Crawler is a fully hydraulic excavator.
Engine
power is converted to hydraulic energy, then
reconverted
to mechanical force by means of
cylinders and motors.
single spool valve (optional) to the machine's
functions. To get maximum use of the engine's
power, a "Power Sensing" valve is connected
between the two main pumping circuits.
In the hydraulic system, oil from a 2-section gear
pump is routed through two 4-spool valves and a Figure 5
shows the distribution of the engine power
to the
hydraulic and electrical systems. The machine
has a
pilot·operated hydraulic control system.
SWING
MOTOR
BRAKE
GEARBOX
SWING· CROWD
LEFT TRACK -FAST HOIST
CONTROL
VAL VE
CYLINDER
CIRCUIT
GEARBOX
HOIST-TOOL
AUX
RIGHT TRACK -AUXILIARY
----; VALVE
CONTROL VALVE (OPT.)
LEVELER
- - •
-.: CYLINDERS
CIRCUIT
2 SECTION
HYO. PUMP
HOIST
CYLINDER
CIRCUIT
AUXILIARY
CIRCUIT
L
-· r' _____ T _______ _
I I
I I
GEARBOX
,-
1
I
I ---~ I
I
I
I L - - - - - - - - - - - - - -
-.J
L- - - - - - - - - - - - - - - - -- - - - - - - - - -
Figure 5. Block Diagram - SOD Crawler
30LENOIO
CONTROL
VALVE
MODULATOR
VALVES
ENGINE
CHARGE
PUMP
I
I
I
J
7
Find manuals at https://best-manuals.com

GENERAL
SPECIFICATIONS
ENGINE:
Detroit Diesel 6V-53N
Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diesel, 2 stroke cycle,
Case
504
BOT
Diesel, 4 stroke cycle,
turbocharged
Number
of
cylinders
..........................
.
Bore
........................................
.
Stroke
......................................
.
Displacement
................................
.
Compression Ratio
...........................
.
Horsepower
SAE
Net
..........................
.
Horsepowerat Gov. Speed
.....................
.
High (no load) rpm
............................
.
Load rpm
..................................
.
Idle speed
.................................
.
Undercarriage:
naturally aspirated
6
3.875 in (98.4 mm)
4.5
in (114 mm)
318
cu in (5.2 litre)
21
to
1
174
(129.8 kW)
190
(141.7 kW)
2530
2400
550-600
6
4.625 in (117.5 mm)
5 in
(127
mm)
504 cu in (8.2 litre)
15.8
to
1
189 (140.9 kW)
206
(153.6 kW)
2230-2270
2100
725-775
Track Frame
.........................................
,
...
,.
.........
Rigid, welded
constrution
Track Idlers
........................................
Sealed hub, spring cushion, hydraulic adjust
Crawler Drive
.........................................
Hydraulic gear motor, spurgear final drive
Track Brake
....................................
Hydraulically released disc, on
input
to
final drive
Track Rollers
......................................
Cast and machined construction, sealed hub
Carrier Rollers
................................
Cast and machined
construction,
sealed, 2 perside
Track Gauge -Narrow Position
....................................................
8
ft
(2.43
m)
Track Gauge
-Wide
Position
......................................................
9
ft
(2.74
m)
Electrical System:
Machines through
PIN
6280344
........................
24
volt start,
12
volt operating,
direct
current
negative ground;
72
amp alternator
Machines
with
PIN
6280345 and
After
.......................
24
volt,
direct
current, negative ground
42
amp alternator
Hydraulic System:
Type
..........................................................
Two pump circuits, summated
Pump (Main)
.........................................
Two section gear, driven
off
rear
of
engine
Main Control Valves
.......................
Two 4-spool valves, single spool auxiliary valve optional;
Series and parallel spool
for
simultaneous operation
of
two
or
more
functions
Filters
.........
Two 100 mesh·screens and
two
10
micron full
flow
filters
in return lines; four 140 mesh
screens in
summator
system;
two
screen
diffusers
and
filler
screen in tank
Cylinders
.........
Double-acting type for hoist, crowd, tool and auxiliary
functions,
·single-acting type
for optional leveler
Motors
............................
Gear type
for
swing and track drive functions, internally-valved,
two-speed
motor
for
track drive
Turntable
Swing:
Single race ball bearing
with
integral ring gear; powered by hydraulic gear
motor
through DROTT gearbox. Mei::hanicalry actuated
disc
brake on input to gearbox (for
holding
brake
only).
Boom Options:
"E"
Main Boom
with
9 ft. (2.7
m),
10
ft.
5 in.
(3.2
m),
or
12
ft. (3.65 m)
dipperstick
Attachment
Options:
Standard and Severe Duty
backhoe buckets,
Ditch
Bucket, Front Loading
Bucket, Ripper Tooth, Wrist-O-Twist, Turntable
Leveler.
8
Find manuals at https://best-manuals.com