Jlg 40H Service Manual User Manual download pdf (Page 78)

SECTION 2 - PROCEDURES

2-58 – JLG Lift – 3120240

2.22 RACINE PROPORTIONAL AIR GAP

ADJUSTMENT.

NOTE: The assembly in Figure 2-31 includes select fit parts

in order to maintain a proper air gap. These parts

must remain as an assembly or if disassembled,

controlled to insure that these component parts are

not intermixed with similar parts.

NOTE: In the event that parts do become exchanged or you

suspect the air gap to be incorrect (Too much air gap

will result in loss of auxiliary power operation and

less than full spool shift; too little air will result in

erratic operation.), it may be checked and adjusted

using the procedure below.

a. *With all parts assembled as shown in Figure 2-

31, use a depth mike or other measuring instru-

ment to determine the distance from the end of

the guide tube to the exposed end of the

plunger. Record this dimension.

b. Remove plunger and poppet. With poppet

removed, install plunger and check distance

from the end of the guide tube to the exposed

end of the plunger.

c. Subtract the first dimension from the second

dimension, this will be the amount of air gap.

d. Correct air gap is.018"-.020" with.018" preferred.

If air gap is excessive, it may be reduced by

using a brass drift and hammer. Lightly tap end

of plunger with all parts assembled. Recheck air

gap.

e. If air gap is less than recommended, replace

nose cone assembly.

* All parts must be clean and properly assembled before

making these checks.

Figure 2-31. Racine Proportional Air Gap Adjustment, Machines Built Prior To Mid 1987.

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Jlg 40H Service Manual User Manual Page 78