26
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Book 22464945 (1/07)
SPEED AND PRESSURE REGULATION
Adjustment Instructions
The operating pressure of this unit was set at the facto-
ry to the maximum rating (at full speed). See General
Data. However, this pressure may be reset down to
150 psi (1050 kPa).
Normally, regulation requires no adjusting; but if prop-
er adjustment is lost, proceed as follows:
1.
WITH UNIT STOPPED
, disconnect rod end
bearing on governor cable (GC) at engine gov-
ernor lever.
2.
At bracket (A) near butterfly valve (BV) run nut
(B) back on governor cable housing. Push gov-
ernor cable housing toward lever (C). Tighten
nut (D).
3.
Loosen nut (E) to relax spring (G).
4.
Loosen nut (H). Turn rod (L) in Air Cylinder (AC)
until approximately 3/4 inch (20 mm) between
nut (H) and flats on rod (L).
5.
Turn rod (L) One round into rod end bearing.
Tighten nut (H). Rotate butterfly shaft/lever (C),
open and close, several times to assure that
linkage is not binding.
6.
With engine governor lever in full speed posi-
tion, reconnect rod end bearing.
7.
Take slack out of spring (G) by moving nuts (E)
and (F). Tighten nuts.
XHP 900 Units ONLY:
Adjust spring so it is full
stretched, and nut (F) is at far end of rod, closest to
spring (G). Tighten nuts.
8.
Start unit and allow to warm up for 3 to 5 min-
utes.
9.
Push “Service Air” button on control panel.
10.
With service air valve closed, adjust pressure
regulator (PR) to rated pressure (*) plus 10 psi
(70 kPa) as follows:
11.
Loosen locknut (M) counterclockwise;. Turn
adjustment cap (N) clockwise to increase pres-
sure, counterclockwise to decrease pressure.
12.
Set no load speed (*) by adjusting position of
rod end bearing on governor cable at engine.
Tighten lock nut.
13.
Open service air valve and observe full load en-
gine speed (*). Adjust regulator to give rated
operating pressure (*). Tighten locknut (M).
14.
Close and slowly open service air valve. If en-
gine speed surges, increase tension on spring
(G) by moving nuts (E) and (F).
XHP900 Units
ONLY:
Should not be adjusted by moving nuts
(E) and (F). See Step 7.
If set speeds are not
correct, repeat steps 12, 13 and 14 as required.
15.
To regulate to any pressure between 150 psi
(1050 kPa) and maximum rating (*), make ad-
justments at the pressure regulator.