Jlg 40H Service Manual User Manual download pdf (Page 22)

SECTION 2 - PROCEDURES

2-2 – JLG Lift – 3120240

unwrap reusable or new bearings until they are

ready to install.

4. Lubricate new or used serviceable bearings before

installation. When pressing a bearing into a retainer

or bore, apply pressure to the outer race. If the bear-

ing 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.

Bolt Usage and Torque Application.

1. Use bolts of proper length. A bolt which is too long

will bottom before the head is tight against its related

part. If a bolt is too short, there will not be enough

thread area to engage and hold the part properly.

When replacing bolts, use only those having the

same specifications of the original, or one which is

equivalent.

2. Unless specific torque requirements are given within

the text, standard torque values should be used on

heat-treated bolts, studs, and steel nuts, in accor-

dance with recommended shop practices.

(See Figure 1-1.)

Hydraulic Lines and Electrical Wiring.

Clearly mark or tag hydraulic lines and electrical wiring, as

well as their receptacles, when disconnecting or removing

them from the unit. This will assure that they are correctly

reinstalled.

Hydraulic System.

1. Keep the system clean. If evidence of metal or rub-

ber particles are found in the hydraulic system, drain

and flush the entire system.

2. Disassemble and reassemble parts on clean work

surface. Clean all metal parts with non-flammable

cleaning solvent. Lubricate components, as

required, to aid assembly.

Lubrication.

Service applicable components with the amount, type,

and grade of lubricant recommended in this manual, at

the specified intervals. When recommended lubricants are

not available, consult your local supplier for an equivalent

that meets or exceeds the specifications listed.

Battery.

Clean battery, using a non-metallic brush and a solution of

baking soda and water. Rinse with clean water. After

cleaning, thoroughly dry battery and coat terminals with

an anti corrosion compound.

Lubrication and Servicing.

Components and assemblies requiring lubrication and

servicing are shown in Figures 1-2.

2.3 LUBRICATION INFORMATION.

Hydraulic System.

1. The primary enemy of a hydraulic system is contam-

ination. Contaminants enter the system by various

means, e.g., using inadequate hydraulic oil, allowing

moisture, grease, filings, sealing components, sand,

etc., to enter when performing maintenance, or by

permitting the pump to cavitate due to insufficient

system warm-up or leaks in the pump supply (suc-

tion) lines.

2. The design and manufacturing tolerances of the

component working parts are very close, therefore,

even the smallest amount of dirt or foreign matter

entering a system can cause wear or damage to the

components and generally results in faulty opera-

tion. Every precaution mst be taken to keep hydrau-

lic oil clean, including reserve oil in storage.

Hydraulic system filters should be checked,

cleaned, and/or replaced as necessary, at the speci-

fied intervals required in Figure 1-2. Always examine

filters for evidence of metal particles.

3. Cloudy oils indicate a high moisture content which

permits organic growth, resulting in oxidation or cor-

rosion. If this condition occurs, the system must be

drained, flushed, and refilled with clean oil.

4. It is not advisable to mix oils of different brands or

types, as they may not contain the same required

additives or be of comparable viscosities. Good

grade mineral oils, with viscosities suited to the

ambient temperatures in which the machine is oper-

ating, are recommended for use.

NOTE: Metal particles may appear in the oil or filters of new

machines due to the wear-in of meshing compo-

nents.

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