DRESSTA TD-25M EXTRA, Service Manual

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CYLINDERS
SECTION 10C
Page 15
DRESSTA TD-25M EXTRA
BLADE TILT AND PITCH CYLINDER
Fig. 10C.24. Removing Piston Rod Nut
13. INSPECTION AND REPAIR
1. It is recommended that all new O-rings, wear rings, seals and wiper rings be installed when the
cylinder is disassembled.
2. Wash all parts in a solvent and air dry. Lubricate machined surfaces of usable parts to protect
them.
3. Inspect the cylinder housing for roundness throughout its length. If a tight spot is noticed when
removing the piston, the area of binding should be given particular attention. A cylinder
housing that is out-of-round should be replaced.
4. Check the cylinder housing and piston rod for scratches or grooves. Shallow scratches can
be polished out with fine emery cloth and oil so a smooth surface is presented to the packing.
5. Inspect all sealing ring grooves for scratches, burrs or other damage. "Dress-up" grooves
or replace as necessary.
6. Inspect tapped holes for damaged threads.
7. If the housing eye bushings were removed, remove all rust, scale or paint from the bushing
bore.
14. REASSEMBLY (Refer to Fig.’s 10C.20 and 10C.21)
1. Position socket cap (17) and cover (16) onto cylinder rod (18).
IMPORTANT: Outer end of gland is determined as bolt end and inside end as facing piston.
2. Coat the bore and grooves of gland (10) with fresh grease. Install seal ring (13) by squeezing
the side of the seal together and starting the seal into the groove. Then work the remainder in
with the thumbs. DO NOT use a screwdriver as it will damage the seal.
3. Install O-ring (19) with buffer ring (12), notched edge facing in, into gland (10) and follow with
wear ring (11). Install O-ring with backup ring (9) onto gland (10). Install wiper ring (14) and
slide gland (10) onto rod (18). The tapped holes in gland (10) must face toward the rod ball.
4. Install piston seal (8) onto piston (7). Install O-rings (6) and wear rings (5) on each end of
piston (7). Install and slide piston onto rod (18). Secure with washer (4) and nut (3). Clamp
ball rod into press as shown in Fig. 10C.24. Using a multiplier torque piston nut (3) to
3250 [Nm].