RA 17 041-DT4SM/06.09
Service Manual for CDT4-CDG4
Bosch Rexroth Corp.
Industrial Hydraulics
5
/8
After the cylinder has been completely reassembled, it should
be tested, either on a test bench or in the regular installation.
The cylinder should be tested for cushioning, travel and leakage.
CAUTION:
BE SURE AIR BLEED SCREW ON BOTH ENDS (ITEM
11) ARE COMPLETELY CLOSED.
Cushioning:
1. Turn both cushioning valves completely in and then turn
counterclockwise one (1) full turn.
2. Cycle cylinder a few times by alternating supply pressure to
head and cap ports.
3. Apply supply pressure to the head port. Rod should retract,
decelerate and may stop before completion of the stroke.
4. Apply supply pressure to the cap port. Rod should extend,
decelerate and may stop before completion of the stroke.
Testing
Travel and Leakage
1. Apply supply pressure to the head port. Rod should retract
smoothly without binding. Cylinder should retract, have less
cushioning and make full stroke. Check leakage at the cap end,
no leakage permitted. Check leakage around the rod bearing. No
leakage permitted.
2. Apply supply pressure to the cap port. Rod should extend
smoothly without binding. Cylinder should extend, have less
cushioning and make full stroke. Check leakage at head end, no
leakage permitted.
3. Return piston rod to retract position by applying supply pres-
sure to head port. Remove supply pressure and install cylinder into
service if satisfactory.
Cushion Adjustment
Turn the cushioning valve clockwise to increase the amount of
cushioning and counterclockwise to decrease cushioning. To ob-
tain the most effective cushioning, fi nal adjustment must be made
while the cylinder is operating under normal conditions at normal
operating pressure.
Courtesy
of
CMA/Flodyne/Hydradyne
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Motion
Control
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426-5480
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