Smithco 78-500, Parts & Service, Page: 7 / 38

5
Ser
vice
MAINTENANCE
(CONTINUED)
TIRE PRESSURE
Caution must be used when inflating a low tire to recommended pressure. Over inflating can cause tires to
explode. Tires on the machine should be 18 psi (1.3 bar), castor wheels should be 18 psi (1.3 bar). Improper
inflation will reduce tire life considerably.
ENGINE OIL
Change and add oil according to charts above. Do not overfill. Use a high quality detergent oil. Classified "
Fro Service SF, SG, SH, SJ or higher." Use no special additives. Choose a viscosity according to the table
above.
WHEEL MOUNTING PROCEDURE
MACHINE WHEELS
1. Turn machine off and remove key.
2. Be sure unit is on a level surface. Unhitch from tow vehicle if possible.
3. Block the opposite wheel then the one you are working on.
4. Loosen nuts slightly on wheel to be removed.
5. Jack up machine being careful not to damage underside of machine.
6. Remove nuts, remove wheel.
7. Place new wheel on hub lining up Hex Bolt holes.
8. Torque nuts to 64-74 ft/lb (87-100 Nm) using a cross pattern. Torque again after first 8 hours and every
200 hours thereafter.
9. Lower machine to ground and remove blocks and jack.
FILTER SYSTEM
Filter pack may be cleaned by shaking or spraying off with low pressure water. Filter will disintegrate if high
pressure is used on it.