4.18.4 OIL CHANGE OF LOWER ROLLER, IDLER AND UPPER ROLLER
The high pressure grease is charged in the grease cylinder of the track spring. When adjusting the
shoe tension or disassembling the shoe for maintenance, loosen the grease nipple within one turn to
discharge the grease gradually.
To change the oil of the lower roller and idler,
remove them from the crawler frame and refill the
oil. This procedure is explained below for each
unit. For the name and quantity of changing oil,
see "LUBRICANT, FUEL & COOLANT
SPECIFICATIONS" in Chapter 4.
1. Travel Motor
2. Sprocket
3. Lower Roller
4. Track Shoe
5. Upper Roller
6. Idler
6
5
4
3
2
1
LOWER ROLLER
5
1
1
2
4
2
3
Lower roller
1. Loosen the rubber track shoe on the side where the oil is to be replaced, referring to "CHECKING
AND MAINTAINING TRACK SHOE TENSION" in Chapter 4.
2. Loosen lower roller tightening bolt (1) slightly (about one turn).
3. Start the engine, and use the boom and arm to lower the bucket bottom to the ground on the side
of the lower roller to refill the oil, and lift up the machine.
4. Support the machine with safety strut (5), and then stop the engine.
5. On both the inside and outside of the crawler frame, remove adjusting bolts (1) and washers (2)
and remove lower roller (3).
6. Remove fuel inlet plug (4) with an Allen wrench to drain old engine oil.
7. Refill the specified amount {105 cc (6.4 cu
･
in)} of engine oil through the fuel inlet.
8. Wind a sealing tape around plug (4) and tighten the plug securely. Clean up any oil around the
engine.
9. Apply Loctite #262 to the screw of bolt (1) and temporarily tighten lower roller (3) to the crawler
frame.
10. Remove the safety strut supporting the machine to lower the machine to the ground completely,
and then tighten bolt (1).
Tightening torque: 249.6 to 308.4 N
･
m (184.3 to 227.7 lbf
･
ft)
11. Lift up the machine and adjust the shoe tension. For how to adjust it, see "CHECKING AND
MAINTAINING TRACK SHOE TENSION" in Chapter 4.
[
4. MAINTENANCE
]
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