Maintenance
Printed in U.S.A. 133 50940411/G0219
8. Replace the radiator drain plug and tighten
securely.
9. Fill the radiator with coolant.
NOTE:
Use a low-silicate ethylene glycol-
based coolant, mixed with quality water and
supplemental coolant additives (SCAs) suitable
for heavy-duty diesel engines. See “Fluids/Lubri-
cants Types and Capacities” on page 35 and the
engine operation manual for additional informa-
tion.
10. Reinstall radiator cap and tighten securely.
11. Start and run the engine until it reaches operating
temperature.
12. Check the coolant level according to “Checking
Coolant Level” on page 131.
Belt Maintenance
Check belt condition monthly, or after every 100
hours of use. Replace or adjust if necessary.
NOTE:
On model RT250 machines, the belt is
tensioned by a spring idler and requires no
adjustment. Replace the belt if belt deflection
exceeds 0.6” (15 mm). Refer to the engine
operator’s manual for more details.
Checking and Adjusting Belt Tension
1. Perform the “Mandatory Safety Shutdown Pro-
cedure” on page 20.
2. Wait until the engine has cooled. See
“Maintenance and Service Safety Practices” on
page 25.
3. Open the engine cover according to “Engine
Access” on page 126.
4. Inspect belt (A, Fig. 137) for damage. If
damaged, have belts replaced by an authorized
repair shop.
5. Press on belt (A) mid-way between pulleys to
check deflection. The belt should not deflect
more than 8 mm (5/16”).
6. If deflection is more than 8 mm (5/16”): Loosen
adjustment bolt (C) and rotate alternator (B)
outward until belt tension is correct. Tighten bolt
(C) and re-check belt tension.
Fig. 136 – Radiator Drain Access
Y
X
Fig. 137 – Belt
B
C
A
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