HYDRAULIC AND AIR SYSTEMS 2250 SERVICE/MAINTENANCE MANUAL
2-24
Published 11-06-15, Control # 040-13
7. Extend cylinders to raise counterweights approximately
1 ft (0,3 m) off ground and stop.
8. Retract cylinders to lower counterweights to ground.
Both cylinders should retract at same speed. If they do,
go to step 9
. If they do not, proceed as follows:
a. At faster cylinder, loosen lock nut and turn piston
end counterbalance valve adjusting screw out in
small increments until both cylinders retract at same
speed.
b. Securely tighten lock nut.
9. Repeat steps 5
through 6b with counterweights raised
approximately 3 ft (0,9 m) off ground.
System Speed Checks
Check minimum operating speed of each crane function with
the engine running at high idle (see Table 2-2
on page 2-6).
Load drum speeds are shown on diagnostics screen for each
pump.
Count number of revolutions rotating bed rotates in one
minute to determine swing speed. Make sure crane is in an
area where nothing will interfere with boom or rotating
bed while swinging.
Mark both crawler tumblers and count number of revolutions
they turn in one minute to determine travel speed. Make
sure crane is in an area where it can travel without
interference.
If proper speeds are not indicated, determine cause and
correct.
Travel Straightness
1. Make sure the crane is in an area where it can travel
without interference.
2. Start and run the engine at high idle.
3. Push both crawler handles fully forward to travel forward
at full speed.
4. Travel approximately 100 ft (30 m). Check track prints on
ground.
5. Track prints must be straight to within 1 ft (0,3 m) in 100
ft (30 m). If not, determine cause and correct.
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