7 MAINTENANCE
88
VT-70 High Output US ISO O&M
0404-853 2019-09
7.17 Radiator / Oil Cooler Cleaning
The radiator and oil cooler must be clean to
ensure proper operation. Engine and
hydraulic system overheating, damage and
even failure can result if the radiator/oil
cooler is not kept clean. A pressure washer
or compressed air both work well to blow
debris clear of the fins in the coolers.
To clean radiator / oil cooler:
1. Shut the machine down as described
in section 5.13. Allow the machine to
cool thoroughly.
2. Raise the hood and open the side
panels. Pivot the cooler assembly
away from the engine as shown for access (fig. 7.17-1).
3. Thoroughly clean all coolers with a pressure washer or compressed
air. Wear any appropriate PPE (see section 2.5). Direct spray through the
cooler as shown. (fig. 7.17-2).
Note: If hydraulic oil or engine coolant temperature warnings occur during
operation, clean coolers more often.
7.18 Engine Coolant Change
1. Shut the machine down as described in section 5.13 and allow it to cool
thoroughly, then open the hood, side panels and pivot the cooler assembly.
2. Remove the drain plug (item 2, fig. 7.18-1) and drain the old coolant into a
suitable catch container. Dispose according to mandates.
3. Reinstall the drain plug and tighten, then add specified coolant (chapter 3)
into the reservoir through the fill neck until full.
4. Warm the engine to operating temperature, then turn the engine off, remove
the key and allow the machine to cool.
5. Check the coolant level, and top off (repeat steps 4 and 5 until all air has
been purged and the level is full when cold).
In dusty applications check and clean the coolers and chassis often to
avoid overheating and prevent fires.
Make sure water nozzle is at least 12 in. (30.5 cm), for air 8 in. (20.3 cm) from
the cooler and that the spray is directed straight through the cooler or the cool-
ing fins may be damaged (bent over) which will decrease cooling performance.
NOTICE
7.17-1
7.17-2
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