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WARNING
ELECTRIC SHOCK HAZARD
To reduce the risk of serious injury,
follow the Shutdown Procedure on
page 39 before servicing any part of the
Horizon system and before checking for loose or
shorted wires.
CAUTION
To avoid damaging the electronic components of the
pulse meter module (1) :
1. Do not lay anything on the pulse meter.
2. Be sure the open side of the pulse meter faces
up if you lay it down.
3. Do not twist or force parts. Align parts properly
as instructed.
NOTE: See page 47 to order pulse meters or replace-
ment parts. The older Electronic Fluid Commander
meter, P/N 236–763, is not directly compatible with the
Horizon system. Replace the electronic pulse module
with P/N 238–617. See instructions below.
To Replace the Complete Pulse Meter
1. Follow the Shutdown Procedure on page 39.
2. Disconnect the cable from the pulse meter, taking
note of the wiring polarity.
3. Remove the old pulse meter and install the new
one, following the original wiring polarity.
To Replace the Electronic Pulse Module
1. Follow the Shutdown Procedure on page 39.
2. Disconnect the cable from the pulse meter, taking
note of the wiring polarity.
3. Remove the screws (A). Lift off the electronic pulse
module (1). See Fig. 16.
40
308–607
Maintenance
4. Install a new electronic pulse module. Align the
notches on the underside of the electronic module
with the cutaways in the top of the metering unit
(2). Use the new screws and torque them op-
positely and evenly to 10 to 12 in-lb (1.2 to
1.4 N m).
5. Connect the pulse meter wires to the cable, follow-
ing the original wiring polarity.
To Replace the Metering Unit
1. Follow the Shutdown Procedure on page 39.
2. Remove the screws. Lift off the electronic pulse
module (1). See Fig. 16.
3. Remove the old metering unit (2).
4. Install a new metering unit. Align the notches on
the underside of the electronic pulse module with
the cutaways in the top of the metering unit. Use
the new screws and torque them oppositely and
evenly to 10 to 12 in-lb (1.2 to 1.4 N m).
P/N 238–618 shown
Replacement screws included with items 1 and 2
Torque screws oppositely and evenly to 10–12 in-lb
(1.2–1.4 N m)
Fig. 16
A
1
2
06874
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