Mec 3072ES Building instructions

SERVICE AND PARTS MANUAL
3072ES / 3772ES /
3772ES HD
October 2008
ART_2546
15
15
Serial Number Range
11211001 - Present Part # 91778 R1

1775 Park Street, Suite 77 • Selma, CA 93662 USA
Ph: 1-800-387-4575 • 559-891-2488 • Fax: [phone]
E-mail:[e-mail] • Web:www.mecawp.com
Aerial Platform Sales Corp.
Revision History
Original Release Date: June 2008
Revision: October 2008
Page Reason for Update
Section 5
5-2 Update table - ORF3=.067 - ORF4=.067 -
ORF6=.042
5-3 Update hydraulic schematic
5-8 Update electric schematic
Parts Table of Contents
All Update Table of Contents
Section C
C-2 Update illustration
C-3 Update parts list
C-4 Update illustration
C-5 Update parts list
C-6 Update illustration
C-7 Update parts list
C-8 Update illustration
C-9 Update parts list
C-10 Update illustration
C-11 Update parts list
C-12 Update illustration
C-13 Update parts list
C-14 Update illustration
C-15 Update parts list
C-16 Update illustration
C-17 Update parts list
Section E
E-14 Update illustration
E-19 Update parts list
E-21 Update parts list
E-23 Update parts list
Part Number Index
All New Feature

Table of Contents
"3072ES / 3772ES / 3772ES HD" Service & Parts Manual October 2008
Pagei
Service Manual
INTRODUCTION...............................................................................................I
General SafetyTips ............................................................................................... III
Hydraulic System ............................................................................................... IV
Electrical System................................................................................................ IV
Total System....................................................................................................... IV
Primary Machine Components .............................................................................. V
Primary Machine Components: Compartments.................................................. VI
Primary Machine Components Locator .............................................................. VII
Specifications: ANSI Models ................................................................................ IX
Specifications: CE Models.................................................................................... IX
LUBRICATION ......................................................................................................... X
SECTION 1
HYDRAULICS...............................................................................................1-1
Hydraulic Fluid..................................................................................................... 1-2
Hydraulic System components .......................................................................... 1-4
Wheel Drive .......................................................................................................... 1-4
Parking Brake andTowing Circuit .................................................................... 1-11
Emergency Systems And Procedures ............................................................. 1-12
Steering Circuit.................................................................................................. 1-13
Platform Lift Circuit ........................................................................................... 1-14
Optional Outriggers........................................................................................... 1-16
Cylinder Repair .................................................................................................. 1-17
Hydraulic Manifold............................................................................................. 1-20

Table of Contents
October 2008 "3072ES / 3772ES / 3772ES HD" Service & Parts Manual
Pageii
SECTION 2
ELECTRICAL SYSTEM................................................................................2-1
Electrical System - General ................................................................................ 2-2
Diagnostic LED ................................................................................................ 2-2
Battery Charge Indicator .................................................................................. 2-2
Master Disconnect Switch................................................................................ 2-2
Deutsch Connectors............................................................................................ 2-3
Batteries ............................................................................................................... 2-4
Battery Replacement........................................................................................ 2-6
Battery Charger................................................................................................ 2-7
Controls.............................................................................................................. 2-10
Lower Controls ............................................................................................... 2-10
Upper Controls ............................................................................................... 2-11
Alarms and Switches...................................................................................... 2-12
Limit Switch .................................................................................................... 2-12
Continuity Checks .......................................................................................... 2-14
Motor Controller ............................................................................................. 2-16
SECTION 3
MECHANICAL COMPONENTS ...................................................................3-1
Torque Specifications ......................................................................................... 3-2
Base / Undercarriage........................................................................................... 3-3
Hoses and Cables................................................................................................ 3-3
Raising the Machine............................................................................................ 3-4
Tires/Wheels ........................................................................................................ 3-5
Changing Tires/Wheels .................................................................................... 3-5
Drive Motors......................................................................................................... 3-6
Front Drive Motors............................................................................................ 3-6
Rear Drive Motor with Brakes .......................................................................... 3-6
Steer Cylinder ...................................................................................................... 3-7
Platform Removal ................................................................................................ 3-8
Lift Cylinder Removal and Installation............................................................... 3-9
Scissor Beam Assembly ................................................................................... 3-10
Outrigger Function ............................................................................................ 3-11

Table of Contents
"3072ES / 3772ES / 3772ES HD" Service & Parts Manual October 2008
Pageiii
SECTION 4
TROUBLESHOOTING ..................................................................................4-1
GeneralTroubleshootingTips............................................................................. 4-2
Electrical SystemTroubleshooting .................................................................... 4-4
EZ-Cal ScanTool.................................................................................................. 4-8
EZ-Cal Adjustment ............................................................................................ 4-14
EZ-Cal Setup ...................................................................................................... 4-16
EZ-Cal Diagnostics ............................................................................................ 4-17
EZ-Cal Outrigger Test Mode............................................................................. 4-18
Retrieve Mode And Help Messages FromThe Ez-Cal .................................... 4-21
EZ-Cal HELP Messages..................................................................................... 4-24
TroubleTable ...................................................................................................... 4-30
Hydraulic Pressure Adjustment Procedures................................................... 4-35
Troubleshooting Battery Charger..................................................................... 4-38
SECTION 5
SCHEMATICS...............................................................................................5-1
Hydraulic Schematic ........................................................................................... 5-2
Main Hydraulic Manifold ................................................................................... 5-4
Main Relief Hydraulic Manifold ......................................................................... 5-5
Optional Outriggers Hydraulic Manifold............................................................ 5-5
Electric System.................................................................................................... 5-6
Electric Schematics: Upper Controls, Early Models ......................................... 5-6
Electric Schematics: Upper Controls, Current Models...................................... 5-7
Electric Schematics: Base................................................................................ 5-8
P600 Motor Control Module ............................................................................. 5-9
GP400 Matrix Module .................................................................................... 5-10
Matrix Module Controller ................................................................................ 5-11

Table of Contents
October 2008 "3072ES / 3772ES / 3772ES HD" Service & Parts Manual
Pageiv
Parts Manual
SECTION A: CONTROL BOXES
SECTION B: PLATFORM AND RAILS
SECTION C: SCISSORS
SECTION D: AXLES
SECTION E: HYDRAULICS
SECTION F: BASE
SECTION G: DECALS

"3072ES / 3772ES / 3772ES HD" Service & Parts Manual October 2008
Page I
INTRODUCTION
This manual consists of a Service Section and an illustrated Parts Section .
The
Service Section of this manual is designed to provide you, the customer, with the instructions
needed to properly maintain the MEC self-propelled scissor lift. When used in conjunction with the
illustrated
Parts Section and the Operators Manual (provided separately), this manual will assist you in
making necessary adjustments and repairs, and identifying and ordering the correct replacement
parts.
All parts represented here are manufactured and supplied in accordance with MEC’s quality stan-
dards.We recommend that you use Genuine MEC parts to insure proper operation and reliable
performance.
To obtain maximum benefits from your MEC aerial work platform, always follow the proper operating
and maintenance procedures. Only trained authorized personnel should be allowed to operate or
service this machine. Service personnel should read and study the Operator’s Manual and Service
and Parts Manual in order to gain a thorough understanding of the unit prior to making any repairs.
To help you recognize important safety information, we have identified warnings and instructions that
directly impact on safety with the following signals:
“DANGER”INDICATES AN IMMINENTLY HAZARDOUS SITUATION
WHICH, IF NOT AVOIDED,WILL RESULT IN DEATH OR SERIOUS
INJURY.THIS SIGNALWORD IS LIMITEDTOTHE MOST EXTREME
SITUATIONS.
“WARNING” INDICATES A POTENTIALLY HAZARDOUS SITUATION WHICH, IF
NOT AVOIDED, COULD RESULT IN DEATH OR SERIOUS INJURY.
“CAUTION” with alert symbol indicates a potentially hazardous situation which,
if not avoided, may result in minor or moderate injury. It may also be used to
alert against unsafe practices.
“CAUTION” without alert symbol indicates a situation which, if not avoided, may
result in damage to the machine.

October 2008 "3072ES / 3772ES / 3772ES HD" Service & Parts Manual
Page II
NOTE: The best method to protect yourself and others from injury or death is to
use common sense.If you are unsure of any operation, don’t start until
you are satisfied that it is safe to proceed and have discussed the
situation with your supervisor.
Service personnel and machine operators must understand and comply with all warnings and instruc-
tional decals on the body of the machine, at the lower controls, and the upper controls.
MODIFICATIONS OFTHIS MACHINE FROMTHE ORIGINAL DESIGN
AND SPECIFICATIONSWITHOUTWRITTEN PERMISSION FROM
MEC ARE STRICTLY FORBIDDEN. A MODIFICATION MAY
COMPROMISETHE SAFETY OFTHE MACHINE, SUBJECTING
OPERATOR(S)TO SERIOUS INJURY OR DEATH.
MEC’s policies and procedures demonstrate our commitment to Quality and our relentless ongoing
efforts towards Continuous Improvement, due to which product specifications are subject to change
without notice.
Any procedures not found within this manual must be evaluated by the individual to assure oneself
that they are “proper and safe.”
Your MEC aerial work platform has been designed, built, and tested to provide many years of safe,
dependable service.Only trained, authorized personnel should be allowed to operate or service the
machine.
MEC, as manufacturer, has no direct control over machine application and operation.Proper safety
practices are the responsibility of the user and all operating personnel.
IfThere Is A Question On Application And/Or Operation Contact:
Aerial Platform Sales Corp.
1775 Park Street, Suite 77 • Selma, CA 93662 USA
Ph: 1-800-387-4575 • 559-891-2488 • Fax: [phone]
www.mecawp.com

"3072ES / 3772ES / 3772ES HD" Service & Parts Manual October 2008
Page III
GENERAL SAFETYTIPS
Regular inspection and conscientious maintenance is the key to efficient economical operation of your
MEC aerial work platform.It will help to assure that your equipment will perform satisfactorily with a
minimum of service and repair.
The actual operating environment of the machine governs the inspection schedule.Correct lubrication
is an essential part of preventative maintenance to minimize wear on working parts and ensure
against premature failure.By maintaining correct lubrication, the possibility of mechanical failure and
resulting downtime is reduced to a minimum.
NEVER PERFORM SERVICE ONTHE MACHINEWITHTHE
PLATFORM ELEVATEDWITHOUT FIRST BLOCKINGTHE SCISSOR
ASSEMBLY USINGTHE MAINTENANCE LOCK!
•Block the scissor assembly using the maintenance lock if the
machine is in the elevated/extended position.
•Never leave hydraulic components or hoses open.They must
be protected from contamination (including rain) at all times.
•Never open a hydraulic system when there are contaminants
in the air.
•Always clean the surrounding area before opening hydraulic
systems.
•Use only recommended lubricants.Improper lubricants or
incompatible lubricants may be as harmful as no lubrication.
•Watch for makeshift “fixes”which can jeopardize safety as
well as lead to more costly repair.
Maintenance Lock In Position
3072ES
3772ES
ART_2364

October 2008 "3072ES / 3772ES / 3772ES HD" Service & Parts Manual
Page IV
Hydraulic System
HYDRAULIC FLUID UNDER PRESSURE CAN PENETRATE AND BURN SKIN,
DAMAGE EYES, AND JUNE CAUSE SERIOUS INJURY, BLINDNESS, AND EVEN
DEATH. CORRECT LEAKS IMMEDIATELY.
Hydraulic fluid leaks under pressure may not always be visible. Check for pin
hole leaks with a piece of cardboard, not your hand.
Electrical System
Prevent damage to battery and/or electrical system;
• Always disconnect the negative battery cable first.
• Always connect the positive battery cable first.
If contact is made between the positive side of the battery and a metal surface on the machine when
the negative cable is installed a spark will occur.This can cause damage to the electrical system,
battery explosion, and personal injury.
Total System
Failure to perform preventive maintenance at recommended intervals may result
in the unit being operated with a defect that could result in injury or death of the
operator.
Immediately report to your supervisor any Defect or malfunction. Any defect
shall be repaired prior to continued use of the aerial work platform.
Inspection and maintenance should be performed by qualified personnel
familiar with the equipment.

"3072ES / 3772ES / 3772ES HD" Service & Parts Manual October 2008
Page V
ART_2345 R1
15
REAR
FRONT
FRONT
3072ES
Standard
3772ES
with Outrigger Option
Work
Platform
Extension Deck
Guardrails
Entry
Ladder
Limit
Switch
Outriggers
(option)
Scissor
Assembly
(Beams)
Maintenance
Lock
Battery
Compartment
Pump
Compartment
Lift
Cylinder
Lift
Cylinder
Document Case
Upper
Controls
Extension Deck
Lock Handle
Lower
Controls
Emergency
Lowering Cable
3072ES
Power to Platform
(option)
PRIMARY MACHINE COMPONENTS

October 2008 "3072ES / 3772ES / 3772ES HD" Service & Parts Manual
Page VI
ART_2381
15
15
CONTROL MODULE
POWER MODULE
Battery
Disconnect Switch
Battery
Charger
(single)
Battery
Chargers
(dual)
Battery Charger
AC Connector
Alarm
12 Volt DC Battery
3772ES Emergency Lowering
3772ES Emergency
Lowering Switch
Battery Pack
Eight 6 Volt DC Batteries
Lower Controls
Hydraulic
Pump and Motor
Hydraulic
Reservoir
Hydraulic
Fluid Level
Sight Guage
Hydraulic Fluid
Filter
Relay
GP600
Motor Control
LED
GP400
LED
GP400
Module
Fuse
Hydraulic
Manifold
Main Relief
Manifold
GP600
Motor Control
Module
PRIMARY MACHINE COMPONENTS: COMPARTMENTS

"3072ES / 3772ES / 3772ES HD" Service & Parts Manual October 2008
Page VII
Component Service Section Parts Section
Platform Assembly
Upper Controls2 | 4 | 5 A | F
Deck and Rails3B
ChainClosure B
Optional Gate B
ExtensionDeck B
Control Terminal Strip B
Horn(optional) 2 A | B
Lift Assembly
Beamsintro | 3 C
Maintenance Lock intro C
Lift Cylinders1 | 3 | 4 | 5 C | E
Limit Switch 2 | 4 C
Base Assembly
Front Drive Motorsintro | 1 | 3 | 4 | 5 D | E | F
R Drive Motorsw/Brakesintro | 1 | 3 | 4 | 5 D | E | F
Steering Components1 | 3 C | E | F
Steering Components1 | 3 | 4 | 5 C | E | F
Wheels& Tiresintro | 3 F
Hubsintro | 1 | 3 D | F
Slide Block intro | 3 C
Emergency Lowering 1 | 2 E | F
Hoses& Cables1 | 2 | 3 | E | F
Outrigger (Option) 1 | 3 | 4 | 5 E | F
Power to Platform B | F
Power Module
Battery Pack intro | F
E-Lower Battery intro | F
Component Service Section Parts Section
Control Module
Lower Controls2 | 3 | 4 | 5 A | F
Hydraulic Manifold 1 | 3 | 4 | 5 E | F
Hydraulic Pump 1 | 3 | 4 | 5 F
Hydraulic reservoir intro | 1 F
Hydraulic Filter intro | 1 F
Parking Brake Release 1 E | F
Emergency Lowering 1 E | F
Battery Disconnect 2 | 3 | 4 | 5 F
Battery Charger intro | 2 | 4 F
Outrigger Manifold 1 | 3 | 4 | 5 E | F
Electronic Control Modules
GP600 Motor Control intro | 2 | 4 F
GP400 Module intro | 2 | 4 F
GP400 Matrix Module intro | 2 | 4 A
PRIMARY MACHINE COMPONENTS LOCATOR

October 2008 "3072ES / 3772ES / 3772ES HD" Service & Parts Manual
Page VIII
Working Height*
Platform Height
Platform Entry Height
Stowed Height
RailsFolded Down
RailsUp
Maximum Number of Occupants
Lift Capacity (Evenly Distributed)
Roll-out Deck Capacity
Platform Dimensions
With Deck Extended (inside rails)
With Deck Retracted (inside rails)
PlatformWidth (inside rails)
Guardrail Height
Toeboard Height
Extension Deck Length
Overall Length
OverallWidth
Wheel Base
WheelTrack
Turning RadiusInside
Outside
Ground Clearance
MachineWeight** (Unloaded) (Approx.)
Drive System (Proportional)
Drive Speed (Platform Elevated)
Drive Speed (Platform Lowered)
Lift/Lower Speed (Approx.)
Gradeability
Ground Pressure/Wheel (Maximum)
Tire Size-Standard
Non-marking 12 Ply (Option)
Tire Pressure, 12 Ply Pneumatic
Wheel Load
Wheel Lug NutTorque
Hydraulic Pressure Main System
Lift System
Steer
Input
Output
Hydraulic Fluid Capacity
Power System – Voltage
Dual Battery Chargers
Input
Output
Single Battery Charger
Batteries
Electric Motor
Brakes
Meetsrequirementsof ANSI A92.6-2006 Section 4.
*Working height adds6 feet (2 m) to platform height.
**Weight may increase with certain optionsor country standards.
3072ES3772ES3772ESHD
2 Wheel Drive Standard, 4 Wheel Drive Option
26.0-12D / 380 NHS
120 Volt AC, 50.60 Hz, 18 Amp—240 Volt AC, 50.60 Hz, 9 Amp
Eight 6 Volt DC 350 amp hour industrial, deep cycle
24 Volt DC, 32 Amp, 700 W, Timed Shutoff
120 Volt AC, 50.60 Hz, 18 Amp—240 Volt AC, 50.60 Hz, 9 Amp
48 Volt DC, 32 Amp, 1500 W, Timed Shutoff
8 h.p. (6 kW): 3600 rpm
Multi-disc / Dual RearWheel
48 Volts DC
36.0 ft*
30.0 ft
54 in
108.5 in
78.5 in
3
1,000 lb
400 lb
153.5 in
107 in
56 in
44.7 in
6.0 in
46.5 in
117.25 in
72 in
86.0 in
60.5 in
73.25 in
170.5 in
9.5 in
7062 lb**
0 – 0.4 mph
0 – 3.0 mph
–
60 psi
–
36 sec / 28 sec
45% / 24.2°
11.14 m*
9.14 m
1.4 m
2.75 m
1.99 m
3
454 kg
181 kg
3.90 m
2.72 m
1.44 m
1.14 m
15.0 cm
1.18 m
2.98 m
1.83 m
2.18 m
1.54 m
1.86 m
4.33 m
24 cm
3203 kg**
0 –0.6 km/h
0 – 4.8 km/hr
–
4.14 bar
–
36 sec / 28 sec
45% / 24.2°
750 lb
400 lb
158 in
110 in
60 in
43.5 in
6.0 in
48 in
117.25 in
72 in
86.0 in
60.5 in
73.25 in
170.5 in
9.5 in
7995 lb**
0 – 0.4 mph
0 – 3.0 mph
100 psi
2,987 lb
75-85 ft/lb
3000 psi
2500 psi
2000 psi
23 GAL
43 ft*
37 ft
61 in
105.25 in
74 in
3
Foam-Filled
40 sec / 28 sec
40% / 21.5°
340 kg
181 kg
4.01 m
2.79 m
1.52 m
1.10 m
15.0 cm
1.22 m
2.98 m
1.83 m
2.18 m
1.54 m
1.86 m
4.33 m
24 cm
3626 kg**
0 –0.6 km/h
0 – 4.8 km/hr
7.0 kg/cm²
1355 kg
102-115 Nm
207 bar
172 bar
138 bar
87 liters
13.28 m*
11.28 m
1.5 m
2.67 m
1.85 m
3
Foam-Filled
40 sec / 28 sec
40% / 21.5°
1,000 lb
400 lb
158 in
110 in
60 in
43.5 in
6.0 in
48 in
140 in
73.25 in
86.0 in
60.5 in
73.25 in
170.5 in
9.5 in
8585 lb**
0 – 0.4 mph
0 – 3.0 mph
–
–
43 ft*
37 ft
61 in
105.25 in
74 in
3
40 sec / 28 sec
40% / 21.5°
454 kg
181 kg
4.01 m
2.79 m
1.52 m
1.10 m
15.0 cm
1.22 m
3.56 m
1.86 m
2.18 m
1.54 m
1.86 m
4.33 m
24 cm
3894 kg**
0 –0.6 km/h
0 – 4.8 km/hr
–
–
13.28 m*
11.28 m
1.5 m
2.67 m
1.85 m
3
40 sec / 28 sec
40% / 21.5°
SPECIFICATIONS: ANSI MODELS

8002rebotcOlaunaMstraP&ecivreS"DHSE2773/SE2773/SE2703"
Page IX
SPECIFICATIONS: CE MODELS
Maximum Operating Inclination °3
Working Height*
Platform Height Platform Entry Height
Stowed Height Rails Folded Down
Rails Up
Maximum Occupants
Lift Capacity (Evenly Distributed)
Roll-out Deck Capacity
Platform Dimensions
With Deck Extended (inside rails)
With Deck Retracted (inside rails)
PlatformWidth (inside rails)
Guardrail Height
Toeboard Height
Extension Deck Length
Overall Length
Overall Width
Wheel Base
WheelTrack
Turning Radius Inside
Outside
Ground Clearance
MachineWeight** (Unloaded) (Approx.)
Drive System (Proportional)
Drive Speed (Platform Elevated)
Drive Speed (Platform Lowered)
Lift/Lower Speed (Approx.)
Gradeability
Ground Pressure/Wheel (Maximum)
Tire Size-Standard
Non-marking 12 Ply
Wheel Load
Wheel Lug NutTorque
Hydraulic Pressure Main System
Lift System
Steer
Input
Output
Hydraulic Fluid Capacity
Power System – Voltage
Dual Battery Chargers
Input
Output
Single Battery Charger
Batteries
Electric Motor
Brakes
0 m/s wind
12.5 m/s wind
3072ES 3772ES 3772ES HD
2 Wheel Drive Standard, 4 Wheel Drive Option
26.0-12D / 380 NHS
120 Volt AC, 50.60 Hz, 18 Amp—240 Volt AC, 50.60 Hz, 9 Amp
Eight 6 Volt DC 350 amp hour industrial, deep cycle
24 Volt DC, 32 Amp, 700 W, Timed Shutoff
120 Volt AC, 50.60 Hz, 18 Amp—240 Volt AC, 50.60 Hz, 9 Amp
48 Volt DC, 32 Amp, 1500 W, Timed Shutoff
8 h.p. (6 kW): 3600 rpm
Multi-disc / Dual Rear Wheel
48 Volts DC
36.6 ft*
30.0 ft
54 in
108.5 in
78.5 in
3
2
1,000 lb
400 lb
153.5 in
107 in
56 in
44.7 in
6.0 in
46.5 in
117.25 in
72 in
86.0 in
60.5 in
73.25 in
170.5 in
9.5 in
7868 lb**
0 – 0.4 mph
0 – 3.0 mph
36 sec / 28 sec
45% / 24.2°
11.14 m*
9.14 m
1.4 m
2.75 m
1.99 m
3
2
454 kg
181 kg
3.90 m
2.72 m
1.44 m
1.14 m
15.0 cm
1.18 m
2.98 m
1.83 m
2.18 m
1.54 m
1.86 m
4.33 m
24 cm
3569 kg**
0 –0.6 km/h
0 – 4.8 km/hr
36 sec / 28 sec
45% / 24.2°
750 lb
400 lb
158 in
110 in
60 in
43.5 in
6.0 in
48 in
117.25 in
72 in
86.0 in
60.5 in
73.25 in
170.5 in
9.5 in
8340 lb**
0 – 0.4 mph
0 – 3.0 mph
100 psi
–
75-85 ft/lb
3000 psi
2500 psi
1500 psi
23 GAL
43.6 ft*
37 ft
61 in
105.25 in
74 in
2
2
Foam-Filled
40 sec / 28 sec
40% / 21.5°
340 kg
181 kg
4.01 m
2.79 m
1.52 m
1.10 m
15.0 cm
1.22 m
2.98 m
1.83 m
2.18 m
1.54 m
1.86 m
4.33 m
24 cm
3783 kg**
0 –0.6 km/h
0 – 4.8 km/hr
7.0 kg/cm²
–
102-115 Nm
207 bar
172 bar
103 bar
87 liters
13.28 m*
11.28 m
1.5 m
2.67 m
1.85 m
2
2
Foam-Filled
40 sec / 28 sec
40% / 21.5°
1,000 lb
400 lb
158 in
110 in
60 in
43.5 in
6.0 in
48 in
140 in
73.25 in
86.0 in
60.5 in
73.25 in
170.5 in
9.5 in
8950 lb**
0 – 0.4 mph
0 – 3.0 mph
43.6 ft*
37 ft
61 in
105.25 in
74 in
3
3
40 sec / 28 sec
40% / 21.5°
454 kg
181 kg
4.01 m
2.79 m
1.52 m
1.10 m
15.0 cm
1.22 m
3.56 m
1.86 m
2.18 m
1.54 m
1.86 m
4.33 m
24 cm
4060 kg**
0 –0.6 km/h
0 – 4.8 km/hr
13.28 m*
11.28 m
1.5 m
2.67 m
1.85 m
3
3
40 sec / 28 sec
40% / 21.5°
Wind Speed (Maximum) hpm82hpm82hpm82 ces/m5.21ces/m5.21ces/m5.21
Meets requirements of CE.
*Metric equivalent of working height adds 2 m (6.6 ft.) to platform height.
**Weight may increase with certain options or country standards.
3° up to 9.1 m (30 ft.)
1.5° up to 11.28 m (37 ft.)
3° up to 9.1 m (30 ft.)
1.5° up to 11.28 m (37 ft.)

October 2008 "3072ES / 3772ES / 3772ES HD" Service & Parts Manual
Page X
LUBRICATION
ART_2384
FRONT REAR
35
4
Sight Gauge
1
2
15
15
SPECIFICATION FREQUENCYITEMNO.
2
3
4
5
1 Hydraulic
Reservoir
Hydraulic
Filter
Front Hubs
Steering
Pivots
Slide Block
Fixed
Filter Element
Lithium N.L.G. #2 EP
Purge old grease
Lithium N.L.G. #2 EP
Purge old grease
Lithium N.L.G. #2 EP
Purge old grease
With platform in the stowed position, fill to
the middle of the sight gauge with
ISO32 or equivalent.
Normal usage: change EVERY
SIX MONTHS or 500 HOURS,
whichever occurs first.
Severe usage: change
EVERY THREE MONTHS or
300 HOURS, whichever occurs
first.
MONTHLY or
EVERY 25 HOURS,
Whichever Occurs First
MONTHLY or
EVERY 25 HOURS,
Whichever Occurs First
MONTHLY or
EVERY 25 HOURS,
Whichever Occurs First
Check daily.
Change YEARLY or every
1,000 HOURS, whichever occurs
first.

"3072ES / 3772ES / 3772ES HD" Service & Parts Manual October 2008
Page 1-1
SECTION 1 ................................................................................................................................ 1-1
HYDRAULICS................................................................................................ 1-1
Hydraulic Fluid................................................................................................ 1-2
Hydraulic System components ..................................................................... 1-4
Wheel Drive ..................................................................................................... 1-4
Parking Brake andTowing Circuit ................................................................1-11
Emergency Systems And Procedures .........................................................1-12
Steering Circuit ..............................................................................................1-13
Platform Lift Circuit .......................................................................................1-14
Optional Outriggers .......................................................................................1-16
Cylinder Repair ..............................................................................................1-17
Hydraulic Manifold.........................................................................................1-20
SECTION 1
HYDRAULICS

October 2008 "3072ES / 3772ES / 3772ES HD" Service & Parts Manual
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HYDRAULIC FLUID
Handling Precautions
PERSONS IN REGULAR CONTACT WITH MINERAL-BASED HYDRAULIC FLUID
NEED TO BE AWARE OF THE IMPORTANCE OF THOROUGH HYGIENE, AND THE
PROPER METHODS FOR HANDLING MINERAL OILS IN ORDER TO AVOID
POTENTIAL HAZARDS TO HEALTH.
HYDRAULIC FLUID UNDER PRESSURE CAN PENETRATE AND BURN SKIN,
DAMAGE EYES, AND JUNE CAUSE SERIOUS INJURY OR BLINDNESS.
FLUID LEAKS UNDER PRESSURE MAY NOT ALWAYS BE VISIBLE.
If mineral- based hydraulic fluid is SPLASHED INTO THE EYES, it must beWASHED OUT
THOROUGHLY using abundant quantities of water. If irritation persists, medical advice should be
sought.
Hydraulic Fluid Recommendations
MEC recommends the use of ISO32 hydraulic fluid or equivalent.

"3072ES / 3772ES / 3772ES HD" Service & Parts Manual October 2008
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System Flushing Procedure
1. With platform fully lowered, drain hydraulic fluid from hydraulic reservoir into a clean, empty
container.Dispose of fluid in accordance with local environmental guidelines.
2. When the hydraulic reservoir is empty, remove suction strainer and hoses.
3. Remove the return line on the hydraulic reservoir.
4. Remove the bypass filter and hose.
5. Flush the hoses with clean hydraulic fluid.
6. Discard old bypass filter element and replace.
7. Flush out the reservoir with hoses removed.
8. Reinstall all hoses removed in the previous steps.
9. Fill hydraulic reservoir with filtered, fresh hydraulic fluid (refer to Lubrication Chart).
10. Loosen output hose fittings at pump to flood with hydraulic fluid.Tighten fittings.
11. Briefly operate all functions.Two or three lift cycles may be necessary to purge all air from lift
cylinder(s).
12. When the above procedures have been completed, fill hydraulic reservoir (refer to Lubrication
Chart).
13. Check all leaks and correct as necessary.Machine is now ready to be placed into operation.
NOTE: Avoid mixing petroleum and synthetic base fluids. It is not advisable to
mix fluids of different brands or types, except as recommended.
Beware of hot fluid. Contact with hot fluid may cause severe burns.

October 2008 "3072ES / 3772ES / 3772ES HD" Service & Parts Manual
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ART_2547
15
15
Hydraulic
Pump
Drain Plug
Hydraulic
Manifold
Sight
Gauge
Hydraulic
Fluid Filter
Hydraulic
Filler Cap
HYDRAULIC SYSTEM COMPONENTS
Hydraulic Reservoir Assembly
This consists of the reservoir, a filler cap with
breather, a drain plug, a sight gauge, and a
bypass filter with a 10 micron filter element.
Perform the following weekly:
• Check reservoir for signs of leakage.
Hydraulic Filter
All machines are produced with a filter. It is a
10 micron spin-on, bypassing filter.When the filter
is clogged, hydraulic flow bypasses the filter
element.
Perform the following every six (6) months or
500 hours:
The filter element must be changed. Extremely dirty
conditions may require that the filter be replaced
more often.
Hydraulic Pump
Note: Refer to Hydraulic Manifold and Relief Pressure Adjustment Procedure .
Refer to Section 3 for Remove and Replace instructions.
An electric motor drives the fixed displacement, gear pump.The pump provides hydraulic fluid flow to
operate the machine functions at 8.0 g.p.m.(30.28 l.p.m.) at 3000 r.p.m.There are no adjustments on
the pump.The pump provides power for the lift, drive, brake and steering functions.
WHEEL DRIVE
Note: Refer to Section 3 for Remove and Replace instructions.
There are four (4) hydraulic, fixed-displacement gear wheel motors to provide power to all four wheels
[two (2) front and two (2) rear].
Dynamic Braking Circuit
The two rear wheel motors have integral brakes that are spring held. Hydraulic pressure developed in
the drive circuit, during drive mode, releases the brakes.A fixed orifice in the brake circuit controls the
deceleration rate and initiates a smooth stop.