JLG 41AM (3120872) Service Manual - Manual (Page 30)

SECTION 2 - SERVICE PROCEDURES
2-8 – JLG Lift – 3120872
viscosities suited to the ambient temperatures in which
the machine is operating, are recommended for use.
NOTE: Metal particles may appear in the oil of new
machines due to the wear-in of meshing compo-
nents.
Hydraulic Oil
For best performance, JLG recommends the use of ISO-
Vg grade 32, 46 oil with a viscosity range between 15-250
SUS at 100 degrees F (32-54 cST at 40 degrees C). Refer
to Section 7 for recommended hydraulic oils.
Changing Hydraulic Oil
Use of any of the recommended hydraulic oils eliminates
the need for changing the oil on a regular basis. If it is nec-
essary to change the oil, use only those oils meeting or
exceeding the specifications appearing in this manual. If
unable to obtain the same type of oil supplied with the
machine, consult local supplier for assistance in selecting
the proper equivalent. Avoid mixing petroleum and syn-
thetic base oils. JLG Industries recommends changing the
hydraulic oil annually.
Use every precaution to keep the hydraulic oil clean. If the
oil must be poured from the original container into
another, be sure to clean all possible contaminants from
the service container.
While the unit is shut down, a good preventive mainte-
nance measure is to make a thorough inspection of all
hydraulic components, lines, fittings, etc., as well as a
functional check of each system, before placing the
machine back in service.
Lubrication Specifications
Specified lubricants, as recommended by the component
manufacturers, are always the best choice, however,
multi-purpose greases usually have the qualities which
meet a variety of single purpose grease requirements.
Should any question arise regarding the use of greases in
maintenance stock, consult your local supplier for evalua-
tion. Refer to Table 1-2. for an explanation of the lubricant
key designations appearing in the Lubrication Chart.
2.5 BATTERY CHARGER - ASSEMBLY AND
DISASSEMBLY
General Information
DO NOT ATTEMPT TO DISASSEMBLE THE BATTERY CHARGER
IF MACHINE IS STILL UNDER WARRANTY. OPENING THE BAT-
TERY CHARGER WHILE THE MACHINE IS UNDER WARRANTY
WILL VOID THE CHARGER WARRANTY. IF UNDER WARRANTY
REQUEST A REPLACEMENT CHARGER FROM THE FACTORY.
ALSO BEFORE REPLACING ANY COMPONENT, USE THE CHAR-
GER MANUFACTURERS (SCR) BATTERY CHARGER MANUAL
INCLUDED WITH THE MACHINE FOR CHECKING THE INTERNAL
AC AND DC CIRCUITS TO DETERMINE WHICH COMPONENT HAS
FAILED. COMPLETE WIRING DIAGRAMS PERTAINING TO YOUR
MODEL CHARGER ARE ALSO INCLUDED IN THE MANUFACTUR-
ERS (SCR) BATTERY CHARGER MANUAL.
The AM Series dual AC input battery charger allows for
replacement of the following internal components. Con-
sult your Illustrated Parts Manual for part numbers of
these components which are available from the JLG Parts
Department:
• Transformer
• Printed Circuit Board
• Shunt Assembly
• Interlock Relay
• SCR Rectifier
• AC Circuit Breaker
• DC Circuit Breaker
Replacement and troubleshooting of these components
requires removal of the battery charger from it’s mounting
on the charger/battery box assembly.
Battery Charger Removal
1. If plugged in, unplug the AC voltage cord from AC
receptacle and remove the charger/battery box unit
from the machine.
2. Disconnect the + (RED) and – (BLACK) charging
wires from the charger to the battery terminals in the
lower battery compartment.
3. Remove the four (4) mounting bolts and washers
located on the back of the upper battery box sec-
tion, securing the charger into the upper section.
4. Remove the charger through the front opening while
pulling the charging wires (RED/BLACK) through the
hole on the bottom of the upper battery box section.