109
Maintenance
SP 500 / 750-15 / 750-18 / 1000 / 1250 Operation Manual
6. Release the concrete pump forward/reverse or
Ram Change button to stop the dierential cyl-
inders. Shut o the engine. Apply Loctite 242 or
equivalent to 2 of the M20 bolts. Place the spacer
coupling up against the ange of the new ram. In-
stall two of the M20 bolts (with Loctite) and bush-
ing, nger-tighten only.
It is important to install the spacer ange against
the new ram rst, not the cylinder ange. This
gives you an extra 6 – 8 inches of safety margin
when you extend the cylinder to meet the spac-
er ange. If you attach to the cylinder ange
rst, chances are good that you will accidentally
knock the new ram into the material cylinder so
far that you won’t be able to reach it.
Figure 28
Attach spacer coupling to ram
7. Restart the engine and clear the E-stops. Press
the concrete pump forward or reverse button and
Ram Change Mode button simultaneously. Slowly
move the cylinder down to where its ange butts
up to the spacer coupling. Be careful not to go too
far (Figure 29).
Figure 29
Move cylinder to spacer coupling
8. Release the concrete pump forward/reverse or
Ram Change button to stop the dierential cylin-
ders. Shut o the engine. You may have to slightly
rotate the spacer coupling to align the bolt holes
with the cylinder ange. When aligned, coat the
remaining two M20 bolts with Loctite and install,
including the bushings. Once all four bolts are
started, you may tighten the bolts to the torque
spec for M20 10.9 bolts (420 ft/lbs).
9. Repeat all steps in the “Remove the old rams pro-
cedure” and “Install the new rams procedure” for
the righthand side ram.
10. Open the shuto valve (Figure 30). The unit will
not stroke with this valve closed.
Quarter Turn
Shutoff Valve
Figure 30
Open the quarter turn shut-o valve
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