106
Maintenance
SP 500 / 750-15 / 750-18 / 1000 / 1250 Operation Manual
Remove the old rams
1. Close the concrete pump quarter turn shuto
valve located on the concrete pump control block
(Figure 16).
Quarter Turn
Shutoff Valve
Figure 16
Close the quarter turn valve
2. Drain the waterbox. Remove the waterbox cover,
and the bolt-down grate.
3. Using the cable remote, press and hold the con-
crete pump forward or reverse button, while si-
multaneously pressing the Ram Change mode
button. Both buttons must be pressed within a
half second of each other, in order to move the
dierential cylinders. To stop the dierential cyl-
inders, release either the concrete pump forward/
reverse button or Ram Change Mode button. To
activate the dierential cylinder again - release
any pressed button, then simultaneously press
both the concrete pump forward/reverse and
Ram Change Mode button again.
+
or
Figure 17
Press concrete pump forward or reverse button with
and ram change button to move dierential cylinders
4. Retract the left-hand side dierential rod almost
all the way into the waterbox (Figure 18). Leave
about 1.5 inches of travel, which will allow you to
remove the spacer coupling (dogbone). When in
position, shut-o the engine.
Figure 18
Retract spacer coupling (dogbone) into the waterbox
5. Using the 50-mm open-end wrench and 24–30
mm box-end wrench provided with the unit, place
the 55-mm wrench on the spacer coupling to hold
the assembly from turning. Use the 24–30 mm
box-end wrench to unscrew the four M20 bolts
that hold the assembly together (Figure 19).
Figure 19
Removing the spacing coupler
6. Restart the engine and clear the E-stops. With
the concrete pump forward or reverse button and
Ram Change Mode button pressed, nish retract-
ing the lefthand side rod into the waterbox. The
spacer coupling will fall out. Release the concrete
pump forward/reverse or Ram Change button to
stop the dierential cylinders. Shut o the engine.
7. Remove the spacer coupling from the waterbox
(Figure 20).
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