SECTION 2 - GENERAL SERVICE INFORMATION
2-4 – JLG Lift – 3121741
2.3 SERVICING AND MAINTENANCE GUIDELINES
General
The following information is provided to assist you in the
use and application of servicing and maintenance proce-
dures contained in this chapter.
WHEN AN ABNORMAL CONDITION IS NOTED AND PROCEDURES CON-
TAINED HEREIN DO NOT SPECIFICALLY RELATE TO THE NOTED IRREGU-
LARITY, WORK SHOULD BE STOPPED AND TECHNICALLY QUALIFIED
GUIDANCE OBTAINED BEFORE WORK IS RESUMED.
Safety and Workmanship
Your safety, and that of others, is the first consideration
when engaging in the maintenance of equipment. Always
be conscious of component weight. Never attempt to
move heavy parts without the aid of a mechanical device.
Do not allow heavy objects to rest in an unstable position.
When raising a portion of the equipment, ensure that ade-
quate support is provided.
NEVER WORK UNDER AN ELEVATED PLATFORM UNTIL PLATFORM HAS
BEEN SAFELY RESTRAINED FROM ANY MOVEMENT BY BLOCKING OR
OVERHEAD SLING.
Cleanliness
The most important single item in preserving the long ser-
vice life of a machine is to keep dirt and foreign materials
out of the vital components. Precautions have been taken
to safeguard against this. Shields, covers, seals, and filters
are provided to keep the wheel bearings, mast sections
and oil supply clean; however, these items must be main-
tained on a scheduled basis in order to function properly.
At any time when oil lines are disconnected, clear adjacent
areas as well as the openings and fittings themselves. As
soon as a line or component is disconnected, cap or cover
all openings to prevent entry of foreign matter.
Clean and inspect all parts during servicing or mainte-
nance, and assure that all passages and openings are
unobstructed. Cover all parts to keep them clean. Be sure
all parts are clean before they are installed. New parts
should remain in their containers until they are ready to be
used.
Components Removal and Installation
Use adjustable lifting devices, whenever possible, if
mechanical assistance is required. All slings (chains, cables,
etc.) should be parallel to each other and as near perpen-
dicular as possible to top of part being lifted.
Should it be necessary to remove a component on an
angle, keep in mind that the capacity of an eyebolt or sim-
ilar bracket lessens, as the angle between the supporting
structure and the component becomes less than 90
degrees.
If a part resists removal, check to see whether all nuts,
bolts, cables, brackets, wiring, etc., have been removed
and that no adjacent parts are interfering.
Component Disassembly and Reassembly
When disassembling or reassembling a component, com-
plete the procedural steps in sequence. Do not partially
disassemble or assemble one part, then start on another.
Always recheck your work to assure that nothing has been
overlooked. Do not make any adjustments, other than
those recommended, without obtaining proper approval.
Pressure-Fit Parts
When assembling pressure-fit parts, use an “anti-seize” or
molybdenum disulfide base compound to lubricate the
mating surface.
Bearings
When a bearing is removed, cover it to keep out dirt and
abrasives. Clean bearings in nonflammable cleaning sol-
vent and allow to drip dry. Compressed air can be used
but do not spin the bearing.
Discard bearings if the races and balls (or rollers) are pit-
ted, scored, or burned.
If bearing is found to be serviceable, apply a light coat of
oil and wrap it in clean (waxed) paper. Do not unwrap
reusable or new bearings until they are ready to install.
Lubricate new or used serviceable bearings before instal-
lation. When pressing a bearing into a retainer or bore,
apply pressure to the outer race. If the bearing is to be
installed on a shaft, apply pressure to the inner race.
Gaskets
Check that holes in gaskets align with openings in the
mating parts. If it becomes necessary to hand-fabricate a
gasket, use gasket material or stock of equivalent material
and thickness. Be sure to cut holes in the right location, as
blank gaskets can cause serious system damage.
Go to Discount-Equipment.com to order your parts
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