Manitowoc Published 11-06-15, Control # 040-13 2-5
2250 SERVICE/MAINTENANCE MANUAL HYDRAULIC AND AIR SYSTEMS
Changing Oil
Drain and refill the hydraulic system every 1,000 hours or
semiannually, whichever comes first, unless an alternate
interval has been established through an oil analysis
program.
1. Operate the crane until hydraulic oil is at its normal
operating temperature. This will help prevent impurities
from settling in system.
2. Stop the engine.
3. Open drain valve on hydraulic tank to completely drain
tank.
4. Disconnect air piping at connections to fully access
clean-out covers.
5. Clean all dirt off access covers on hydraulic tank. Then
remove covers from tank and proceed as follows:
a. Clean out any sediment inside tank.
b. Remove diffusers (Figure 2-3
, View A) from inside
tank.
Soak diffusers in diesel fuel and blow clean and dry
with compressed air. Replace any damaged parts.
c. Reinstall diffusers after cleaning.
6. Use new seals and fasten access covers to tank.
7. Replace suction filter elements.
8. Clean fill cap assembly.
9. Fill hydraulic tank to specified level with proper hydraulic
oil (see Lubrication in Section 9 of this manual).
Filter oil with a 10-micron element as oil is added to
tank.
10. Start and run engine at low speed for 10 – 15 minutes to
fill all lines with oil and to bleed any air from system.
11. Stop engine and fill hydraulic tank to specified level.
NOTE: If the hydraulic system is extremely dirty (gum or
lacquer formation on parts indicated by erratic,
jerky, or sluggish operation) repeat the Changing
Oil procedure after 48 hours of operation.
CAUTION
Air System Contamination!
Clean outside of air piping to prevent dust and dirt from
entering air system when air piping connection is opened
to access hydraulic tank clean-out covers.
Hydraulic Oil Contamination!
Take precautions to prevent dust and wind-blown dirt from
entering tank while covers are off.
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