IM-F01-30
ST Issue 5
11
4.3 ITD32 service information
Repair of disc/seat
Remove the insulating cover if fitted and unscrew the cap using a suitable socket or spanner.
Do not use Stillsons or a wrench of a similar type which may cause distortion of the cap.
If the disc and body seating faces are only slightly worn, they can be refaced by lapping
individually on a flat surface such as a surface plate. A figure-of-eight motion and a little
lapping compound give the best results.
If the wear is too great to be rectified by simple lapping, the seating faces on the body must be
ground flat and then lapped. The disc should be renewed. The total amount of metal removed
in this way should not exceed 0.25 mm (0.010").
When reassembling, the disc is normally placed with the grooved side in contact with the
seating faces. The screw-on cap does not require a gasket, but a suitable high temperature
anti-seize grease should be applied to the threads. Tighten to the recommended torque (see
Table 2).
How to fit the strainer screen
If a waterlogging sensor is fitted, it will be necessary to disconnect the wiring at the terminal
block.
Undo and remove the sensor adapter (the sensor does not have to be removed from the
adapter). Clean or replace the screen as required. Replace the screen and sensor assembly,
ensuring that the screen is located centrally. Fit new gasket and ensure that the joint faces
are clean. A fine smear of Molybdenum Disulphide grease should be applied to the first few
threads. Tighten to the recommended tightening torque. Reconnect the waterlogging sensor
as described in IM-P087-34. The ITD32L and ITD32H are fitted with a 0.8 mm perforated
screen. The ITD32LA and ITD32HA are fitted with a 100 mesh screen.
How to replace or clean the sensor
If a waterlogging sensor is fitted, it will be necessary
to disconnect the wiring at the terminal block.
Remove the sensor from the adapter. This can be
done in line so long as the adapter is securely held
in place. Clean the sensor insulation. If pitting of the
insulation occurs, a new sensor should be fitted.
Replace new sensor and screw into the adapter
ensuring the gasket is centralised. Tighten to the
recommended tightening torque (see Table 2).
Reconnect the waterlogging sensor as described
in IM-P087-34.
Ensure that any sensor fitted to the ITD32 has a
letter 'L' stamped on the hexagonal face.
Table 2 Recommended tightening torques
Item Part
or
mm
N m
(lbf ft)
2
ITD32L
and LA
36
135 - 150 (99 - 110)
ITD32H
and HA
41
135 - 150 (99 - 110)
6
IBP21S
32
M28
170 - 190 (125 - 140)
8
IBP30
24
50 - 55
(37 - 40)
6
8
2
Groove identifies LA and HA versions
ITD32LA
and ITD32HA
Anti-air-binding
disc
ITD32
