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Maintenance 3.8 - Setting Hydraulic Pressures
TL38 Service & Parts
SLEW CROSS-LINE RELIEF VALVES
1. Operate the hydraulic system for 10-15 minutes to warm the oil.
2. Remove the cover from the 1st post.
3. Insert pressure gauge into high pressure gauge port marked ‘PT’ on top of front face of main
manifold block.
4. Loosen locknuts on both cross-line relief valves and turn adjusting screws counter clockwise
two full turns.
5. Operate slew function from lower controls and rotate elevating assembly through approx.
180 degrees until the slew stop prevents further rotation.
6. Slowly turn the cross-line relief valve adjusting screw clockwise until the pressure gauge
reads 50 Bar pressure.
7. Now operate the slew function in the opposite direction through approx. 360 degrees until
the slew stop prevents further rotation.
8. Slowly turn the remaining cross-line relief valve adjusting screw clockwise until the pressure
gauge reads 50 Bar pressure.
9. Tighten the locknuts on both cross-line reief valves while holding the adjusting screws in posi-
tion.
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