Delavan T90 - Manual (Page 2)

Figure 1. Plumbing for Pump Installation
When using a quick coupler, line up key in the
quick coupler with keyway on pump shaft and slide
coupler into place, also lining up other set screw
with spot on shaft. Tighten the set screw over the
spot on the shaft first, then the keyway set screw.
When using quick couplers, pull collar back and
slide onto the PTO shaft until it locks into place,
release collar.
When using a Collar Coupler, slide onto pump
shaft, then PTO shaft, leaving 1/4” to 3/8” of PTO
spline visible. Tighten both ends of the coupler with
a wrench.
Position pump below liquid level in tank to assure
priming.
On other than PTO installations, check pump
rotation. An arrow on the pump shows direction of
rotation.
To keep pump from rotating with PTO shaft, use
a torque bar and chain assembly 33680 (Fig. 3).
Bolt bar to pump, using two adjacent flange bolts.
Snap one end of chain to the torque bar and the
other end to a stationary part of the tractor. Mount
the torque bar so the counter force will raise up on
Pump Installation
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the pump and help relieve the side pressure due to
weight of the pump and hose. Do not fasten pump
rigidly to the tractor.
With the pump in position, connect the inlet hose
to the IN port. Use a 1 1/2” I.D. hose if you need
maximum flow rates (Fig. 1).
A high capacity strainer with a 20-mesh screen
must be used on the inlet side (Fig. 1).
For in-line protection of nozzles, use a 40-mesh
strainer in the boom feed line. Use a 3/4” or 1” Y-
type strainer (Fig. 1).
To regulate pressure, install either a 1 1/4” ball
valve or 1” pressure regulating valve downstream
from the pump discharge (Fig. 1). Do not use a
spring-loaded valve.
Check all hose connections. Loose connections
can permit air to be drawn in and the pump may
not prime properly.
Note: Support hoses where necessary to keep
weight off the pump.
Caution: Failure to use a suction strainer, as
specified, may void the product warranty.