Hydraulic Test Procedures - Bolens DuraTrac DGT 1800 Service Manual

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HYDRAULIC SYSTEM (Continued)
5100 SERIES
TRACTOR
PAGE 6·7 Rev. 3192
HYDRAULIC SYSTEM TEST PROCEDURES (Continued)
TEST PROCEDURE NO. 5 (Fig.
6-4],
HYDRAULIC CYLINDER
INTERNAL LEAKAGE TEST
CAUTION
CAUTION SHOULD BE
EXERCISED WHEN
PERFORMING THIS TEST. IT
IS PERFORMED WITH OPEN
CONNECTIONS WHICH COULD
EMIT LARGE VOLUMES OF
FLUID IF EXTREME CYLINDER
LEAKAGE IS PRESENT OR
THE CONTROL IS MOVED TO
THE WRONG POSITION
DURING STEP 5. WEAR EYE
PROTECTION WHEN
PERFORMING THIS TEST.
1. Move valve control to fully extend
or retract the cylinder to be tested.
2. SHUT ENGINE OFF.
3. Remove the RETURN hydraulic
hose from the cylinder barrel. See
Figure 6-4.
4. Wrap the loose end of the hose
with a shop towel to contain oil which
may
leak during test.
5. Start engine and activate valve
control in the SAME DIRECTION AS
step 1 , holding pressure on the
cylinder for 15-20 seconds and
observing the open cylinder fitting.
6. Any sustained dripping from the
open cylinder fitting indicates leakage
around the internal sealing
components.
7. If no leakage is observed, SHUT
ENGINE OFF and connect the hose
removed in step 3.
Fig_ 6-4
8. Start engine and move control to
position the cylinder in the opposite
direction as in step 1.
9. Repeat steps 2through 6.
1 0. If leakage from the open cylinder
filling is observed in either test
position, the cylinder must be
disassembled and appropriate repairs
performed.
NOTE: the 5100 Series power
steering cylinder is non-repairable
and must be replaced to correct
internal leakage.
11. If no internal cylinder leakage is
evident, remaining un-tested
components, such as the control
valve are suspect and should be
evaluated.
8
PRESSURE
IN
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