CYLINDERS SECTION 10C
Page 27
DRESSTA TD-25M EXTRA
RIPPER LIFT AND PITCH CYLINDERS
23. INSPECTION AND REPAIR
1. It is recommended that all new O-rings, wear rings, seals and wiper ring 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 or rod eye bushings were removed, remove all rust, scale or paint from
the bushing bore.
24. REASSEMBLY (Refer to Fig.’s 10C.36 and 10C.37)
1. Position cover (17) onto cylinder rod (18).
IMPORTANT: Outer end gland is determined as bolts end and inside end as facing piston.
2. Coat bores and grooves of gland (11) with fresh grease. Install seal ring (14) 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 with buffer ring (13), notched edge facing in, into gland (11) and follow with wear
ring (12). Install O-ring with backup ring (10) and wiper ring (15) into gland (11). Slide gland
(11) onto rod (18), tapped holes toward rod eye.
4. Install piston seal (8) onto piston (9). Install O-rings (7) and wear rings (6) on each end
of piston (9). Install piston (9) onto rod (18). Secure with washer (5) and nut (4). Clamp
rod assembly into press as shown in Fig. 10C.40. Using a multiplier and torque the nut
to 3240 [Nm].
5. Secure cylinder housing (1) to hoist frame. Attach hoist to rod eye and lower rod assembly into
housing (1) using extreme care not to damage wear rings (6) and piston seal (8). Once piston
has entered housing, drive rod 1/2 stroke.
6. Tie cover (17) to rod eye to provide working clearance. Start gland (11) into housing (1) and
drive in just below lock ring groove in housing. Install lock ring (16) into housing groove. Insert
two puller bolts 1/2”NC x 1-3/4” with nuts (Fig. 10C.41) and thread into gland. Tighten nuts to
draw gland up against lock ring (16). Remove puller arrangement and lift cover (17). Coat inner
cylinder housing surface over the gland with high temperature type 230 HHT grease 1 [mm] in
thickness. Secure cover (17) to gland (11) and torque the bolts with washer to 75 - 90 [Nm].
7. If removed, press new bushings (2 and 19) to cylinder housing (1) and to cylinder rod (18).
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