DeZurik POWERRAC R1 Manuale di istruzioni - Pagina 12
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DeZURIK
Spring-Return Cylinder Reassembly
6. Place the piston rod seal (S3) in the cylinder head (S1).
7. Push the piston rod (S4) through the cylinder head (S1) so that the piston (S7) is against the
cylinder head.
8. Place the two cylinder tube O-rings (S5) in the groove in the cylinder head (S1) and in the
groove in the cylinder cap (S11).
9. Using care to avoid damage to the piston seal (S9), replace the cylinder tube following the
appropriate steps for the size:
a. If the cylinder tube (S6) diameter is 6" (150 mm), place the cylinder tube over the piston
(S7) at about a 45° angle. Carefully square the cylinder tube into alignment with the
piston, and push the cylinder tube into position on the cylinder head (S1).
b. If the cylinder tube diameter is 4" (100 mm), push the cylinder tube on straight, without
the angle.
10. Note the end of the spring assembly (S19) that has a 11/8" (29 mm) diameter machined hole.
With the hole toward the piston (S7), carefully insert the spring assembly into the cylinder tube
(S6) so that the hole fits over the piston nut (S10). Do not damage the cylinder wall with the
spring assembly during this step.
11. Align the holes in the cylinder cap (S11) with the tie rods (S12) and insert the cylinder cap into
the cylinder tube (S6). Place the tie rod nuts (S15) and washers (S13) on the tie rods. If the
cylinder tube diameter is 4" (100 mm), tighten the nuts (5/16") to 12 ± 2 foot pounds (16 ± 3
Nm); if the cylinder tube diameter is 6" (150 mm), tighten the nuts (1/2") to 16 ± 2 foot pounds
(22 ± 3 Nm).
Actuator Reassembly
Refer to Figure 5 for component identification.
1. Clean and inspect all parts before reassembly.
2. Replace worn parts, especially sealing components such as the O-ring and gaskets.
3. Before reassembly, lubricate the following surfaces:
The flat side of the rack bearing (B3)
Both bearing hubs of the gear (B8)
The top cover O-ring (B10) and the groove in the top cover (B11)
The teeth in the rack (B5) and in the gear (B8)
4. Place the rack bearing (B3) on the pin (B4).
Note: A dab of grease on the curved side of the rack bearing will help to hold it in place.
5. Locate the witness mark on the teeth near one end of the rack (B5).
6. Assemble the end of the rack opposite the witness marks to the end of the piston rod (S4) with
the rack screw (B7) and lockwasher (B6)—do not tighten the screw.
D10389
(Continued)
Page 12
November 2020