01:P224:37-S2 REV.1 PAGE 2 OF 3
DRAWINGS AND PARTS LIST
Figure 1 shows a sectional view of the handwheel fitted to a direct acting
diaphragm actuator.
Figure 2 shows the side handwheel assembly part description and
identification.
MAINTENANCE
Preparation
CAUTION:
DO NOT DISASSEMBLE THE EQUIPMENT
BEFORE RELEASING THE AIR PRESSURE.
Before dismantling the actuator for maintenance set the handwheel to the
neutral position. Note the distance ‘X’ (related to the actuator stroke), this
must be maintained when re-assembling the unit.
Disassembly
1 Following the instructions given in 01-P224-37, release the spring
pre-load, open actuator case assembly, remove diaphragm,
diaphragm plate and detach casing attached to handwheel unit.
2 Disconnect actuator stem from stem extension (041).
3 Remove cover plate (540) on screw housing (039).
4 Remove indicator stop peg (023) and clamp (641).
5 Remove actuator stem nut (629) and pull out stem extension (041).
6 Remove hex head screw (026) and screw housing (039).
7 Unscrew socket head cap screws (027) and remove gear housing
end cap (015) to open gear-housing (602).
8 Remove the handwheel locknut (631), indicator plate (640) and
handwheel (024) together with the key (632).
9 Remove handwheel stem nut (628) and pull out the handwheel stem
(627), distance piece (642), worm (634) together with thrust bearings
(536).