DRESSTA TD-25M EXTRA, Service Manual

Page: 215 / 595

STEERING DRIVE
SECTION 7E
Page 3
DRESSTA TD-25M EXTRA
GENERAL
Springs Data
Description
Free Length
[mm]
Test Length
[mm]
Test Load
[N]
Total
Number of
Coils
Steering Drive:
Brake piston applying spring 87.2 77.5 1104 - 1189 9
High range clutch return inner spring 34.4 25.4 384 - 416 6.5
High range clutch return outer spring 37.6 25.4 564 - 610 5
Low range clutch piston return spring 57.2 38.1 367 - 398 10
Upper Steering Valve:
Brake spool outer spring 55.5 36 608 6.5
Brake spool inner spring 57 34.3 200 9.5
Brake spool poppet spring 41.7 27.4 72.4 – 81.3 13
Lower Steering Valve:
HI-LO spool return spring 88.4 63.7 218 - 227 8.5
Manifold:
Manifold spool spring 49.8 30.9 334 10
STEERING DRIVE
4. REMOVAL
IMPORTANT: It is suggested that the checks in Paragraph 13, SECTION 7, STEERING SYSTEM
OIL PRESSURE CHECK and Paragraph 14, SECTION 7, STEERING SYSTEM FUNCTIONAL
CHECK be made before removing the steering drive. In this manner, hydraulic malfunctions can be
pinpointed and corrected at time of teardown.
WARNING! Before working at the machine, be sure that the blade and ripper have
been lowered to the ground, engine is OFF, the drive train control lever is in
NEUTRAL position, drive train neutral lock lever is in ON position and parking
brake is set. The starting switch and the electrical system master switch are turned
OFF, keys are removed and the controls are tagged to prevent inadvertent engine
starting.
IMPORTANT: Disconnected hydraulic lines must be properly capped with the correct size plastic
cap. If caps are not available, use tape or rubber stoppers. Openings must never be plugged with
rags. This practice could introduce dirt or lint into critical hydraulic components. Remove all
dirt accumulation from the main frame cover. Tag disconnected lines to facilitate faster and
correct installation
.
1. Turn the electrical master switch to OFF position and take the key out.
2. Remove transmission case guard from bottom of machine.