Lubrication Schedule; Oil Specification; Oil Viscosity; Changing Engine Oil - Hobart 60PL20 Operation And Maintenance Manual

OM-2053

(1) Lubrication schedule

Time schedules indicated on the Lubrication Chart, Fig. 1, are approximate. They are based on
average operating conditions. It may be necessary to lubricate more frequently under severe oper-
ating conditions such as: low engine temperatures, excessively heavy loads and high oil tempera-
tures, or intermittent operation. However, time intervals should not exceed those indicated in the
chart without careful evaluation.

(2) Oil specification

Oil recommended by the engine manufacturer is identified by a military specification number, MIL-
L-2104B. Because of the substantial increase in additive concentration in some MIL-L-2104B oils
to meet service "MS" requirements, recommended oil is qualified still further by the following limita-
tions.
(a) Zinc, as zinc diorganodithiophosphate, between a minimum of 0.07 and a maximum of 0.10
percent by weight.
(b) Sulfated ash (ASTM D-874) of 1.00 percent maximum by weight, except lubricants that con-
tain only barium detergent-dispersants where 1.50 percent by weight is allowed.
Diesel lubricating oil specifications are discussed in the Perkins Diesel Operator's Manual in
Chapter 6.

(3) Oil viscosity

The use of an SAE-30 grade oil is recommended for year-round service. The engine is equipped
with an ether starting aid to assist in engine starting during cold weather when SAE-30 oil is used.
Multigrade oils are NOT recommended, and should be considered only as a "last resort" to facili-
tate engine starting.

(4) Changing engine oil

Change engine lubricating oil following the instructions in the Perkins Diesel Operator's Manual in
Chapter 6. Lube oil capacity for this engine is 15-1/2 quarts.

(5) Changing engine oil filter

Change oil filter following the instructions in the Perkins Diesel Operator's Manual in Chapter 6.
E. Starter
The starting motor is lubricated at assembly and should be relubricated only when the starter is re-
moved from the engine or when disassembled. Remove pipe plugs on outside of motor and apply a
few drops of light engine oil to the oil wicks.
F. Trailer

(1) Front axle assembly

The front axle assembly, drawbar, and steering linkage are equipped with high-pressure lubrica-
tion fittings. Lubricate the trailer every 400 hours. Use a good quality chassis lubricant such as
Sinclair Litholene Industrial No. 2, Mobil Mobilplex 47, or equivalent. Clean lube fittings before ap-
plying grease.
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December 31/91 Revised