Micromatic, LLC
525 Berne St
Berne, IN 46711
1-260-589-2136 x3211 or 800-333-5752
[email protected]
Page
2
of
14
Repair Manual
–
26R-2 thru 26R-124
11NOV2019
MODEL: 26R
PURPOSE:
To instruct designated personnel in the teardown, inspection, seal replacement and the reassembly
of Rotac® Rotary Actuators. Minor repairs will be examined; however, repairs without proper
engineering information and machine capabilities may be costly. These cases call for factory service
and should be referred to the factory for repair. Factory repairs will bring the unit to the latest
design within that product line. All workmanship and parts will carry a full warranty of 6 months
usage, or 12 months from date of shipment, whichever comes first.
DISASSEMBLY:
Read the special instructions below before proceeding.
Reference FIGURE 4 & FIGURE 4A
–
Parts List Drawing for location
of parts.
1.
Clean exterior of actuator as clean as possible. This will assure you that any material found
in the unit is a result of wear, system contamination or damage. A more accurate evaluation
of the actuator and operating system is thus obtained.
2.
Remove all burrs from the shaft (5) extension prior to disassembly.
3.
Match mark the head (2) and housing (1) so that their relationship can be re-established
when reassembled.
4.
After removing head bolts (22) from the head (2), with the actuator sitting on its mounting
feet strike end of shaft (5) with a plastic /rubber mallet or aluminum bar stock and allow
the shaft (5) to push the head (2) off of the housing.
CAUTION:
DO NOT PRY HEADS OFF!!!
Damage will occur to the housing (1) or head (2). Some of the newer designs have threaded
holes in the head (2) that allow the use of a bolt to assist in separating the head (2) from
housing (1).
5.
Pull the shaft (5) out,
CAUTION:
be careful and support the shaft so that the vane on the
shaft or shaft end does not fall and nick the housing (1).
6.
The shoe (6) will usually come out by pulling on it with your hands, however, it may
sometimes be necessary to pull with your hand while tapping the shoe dowel pins (24)
lightly or grasping protruding dowel with vice grips and pulling the shoe out of the housing.
CAUTION:
NEVER PRY THE SHOE OUT!!!
7.
Remove the retainer bolts (25) and retainer (18) from head (2).
8.
Remove the shaft seal cap (13), the shaft seal (12) and retainer seal (17) using a thin edge
using caution to not scratch or mar surface around seals.
9.
Remove the shims (21), thrust washer (19), inner race of bearing (4) and press-out the
bronze thrust bearing (3) and roller bearing (4). A round solid piece of material may be
required to be placed on the inside face of the bronze thrust bearing (3) to force it out.
CAUTION:
DO NOT DAMAGE SHARP INSIDE EDGE OF THE HEAD.
10.
Repeat steps 7, 8 and 9 for the housing (1).
11.
Remove the seals from the shoe (6) and shaft (5) and inspect for cuts, nicks or any other
unusual conditions of the seal. (Compare to new seal kit).
INSPECTION:
1.
Examine oil residue inside actuator. This may give a clue as to why any damage has
occurred.
A.
Dirty or gritty oil will cause scoring of internal surfaces.
B.
Varnish on internal parts can be a sign of oil in system running too hot.
