9. Trailer and Truck Maintenance
A. General
Trailer maintenance is limited primarily to making certain that the trailer is properly lubricated at the ap-
propriate time intervals. Most lubrication points, such as tie-rods, etc., are equipped with high-pres-
sure lubrication fittings. Refer to Lubrication Chart for lubricants to use and time intervals.
B. Cleaniness
It is important that all grease fittings be cleaned before attaching a grease gun or applicator. Use a
clean cloth to wipe dirt from the fittings.
C. Grease application
Place pressure gun securely on the fitting, so that there is no leakage between the fitting and the ap-
plicator. Apply pressure until old grease is forced out and new grease appears. This will insure that
the grease cavity has been forced out.
Use an oil can to lubricate points such as brake linkage, etc., which are not equipped with grease fit-
tings. A very light grease may also be used if it is preferred to lubricating oil.
Remove wheels to check wheel bearing lubricant.
D. Lubrication chart
Lubrication points are illustrated and identified by name on the Lubrication chart, Figure 4. In Figure
5, number symbols designate the kind of lubricant required and the specification recommended. In
Figure 6, letter symbols designate the normal lubrication period.
Most lubrication points are equipped with high-pressure lubrication fittings. Lubricate the trailer each
400 hours. Use a good quality chassis lubricant
(See Figure 5).
Clean lube fittings before applying
grease. Lubricate and check wheel bearing adjustment each 800 hours or semiannually. Use a good
quality bearing lubricant
(See Figure 5).
NOTE: The chart in Figure 4 shows the trailer assembly identified by Hobart Part No. 408595
and used with the basic generator set in this series, Specification 6906-1. Specifications 6906-3
and 6903-5 require trailers with fifth-wheel front running gear
(Hobart Part No. 281359)
.
For trailers having fifth-wheel front running gear, lubrication procedures and lubricants used for
the drawbar, rear wheel bearings, and front wheel bearings are the same as for Trailer No.
408595. For lubrication of the pivoting mechanism of the fifth-wheel assembly, two Zurk type high
pressure grease fittings are at the very front of this mechanism. See Figure 4A. Lubricate this
mechanism bi-monthly, using lubricant identified by Symbol 1 on the chart below
(Figure 5)
.
As shown in Figure 13 of Section 4-3, the rear axle assembly of trailers in Specifications 6906-3
and 6903-5 is equipped with leaf springs
(item 17)
having hanger brackets
(items 22 and 25).
Lu-
brication where the leaf springs meet the hanger brackets should be done monthly, using lubri-
cant identified by Symbol 1 on the chart below
(Figure 5)
.
OM-2029
September 30/89 Revised
2-1
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