Jeep Cherokee 1999 Electronic Service Manual page 1287

19 - 6 STEERING
DI AGN OSI S AN D T EST I N G (Cont inue d)
Fig. 2 Power Steering Analyzer
(7) Open t h e t est va lve com plet ely.
(8) St a r t en gin e a n d let idle lon g en ou gh t o cir cu -
la t e power st eer in g flu id t h r ou gh flow/pr essu r e t est
ga u ge a n d t o get a ir ou t of t h e flu id. Th en sh u t off
en gin e.
(9) Ch eck flu id level, a dd flu id a s n ecessa r y. St a r t
en gin e a ga in a n d let idle.
(10) Ga u ge sh ou ld r ea d below 862 kP a (125 psi), if
a bove, in spect t h e h oses for r est r ict ion s a n d r epa ir a s
n ecessa r y. Th e in it ia l pr essu r e r ea din g sh ou ld be in
t h e r a n ge of 345-552 kP a (50-80 psi).
(11) In cr ea se t h e en gin e speed t o 1500 RP M a n d
r ea d t h e flow m et er. Th e r ea din g sh ou ld be 2.4 - 2.8
GP M, if t h e r ea din g is below t h is specifica t ion t h e
pu m p sh ou ld be r epla ced.
CAUTION: The next step involves testing maximum
pump pressure output and flow control valve oper-
ation. Do not leave valve closed for more than three
seconds as the pump could be damaged.
(12) Close va lve fu lly t h r ee t im es a n d r ecor d h igh -
est pr essu r e in dica t ed ea ch t im e. All th re e re a d -
in g s m u s t be a bo v e s p e c ific a tio n s a n d w ith in
345 k P a (50 p s i) o f e a c h o th e r.
• P r essu r es a bove specifica t ion s bu t n ot wit h in
345 kP a (50 psi) of ea ch ot h er, r epla ce pu m p.
• P r essu r es wit h in 345 kP a (50 psi) of ea ch ot h er
bu t below specifica t ion s, r epla ce pu m p.
(13) Open t h e t est va lve, t u r n st eer in g wh eel
ext r em e left a n d r igh t posit ion s a ga in st t h e st ops.
Recor d t h e h igh est in dica t ed pr essu r e a t ea ch posi-
t ion . Com pa r e r ea din gs t o specifica t ion s. If h igh est
ou t pu t pr essu r es a r e n ot t h e sa m e a ga in st eit h er
st op, t h e gea r is lea kin g in t er n a lly a n d m u st be
r epa ir ed.
CAUTION: Do not force the pump to operate
against the stops for more than 2 to 3 seconds at a
time because, pump damage will result.
PU M P SPECI FI CAT I ON S
RELIEF
ENGINE PRESSURE
50
9653 kPa
2.5L
(1400 psi)
9653 kPa
4.0L
(1400 psi)
PUMP LEAKAGE DIAGNOSIS
SERV I CE PROCEDU RES
POWER STEERING PUMP – INITIAL
OPERA TION
WARNING: THE FLUID
CHECKED WITH ENGINE OFF TO PREVENT INJURY
FROM MOVING COMPONENTS.
CAUTION: Use MOPAR Power Steering Fluid or
equivalent. Do not use automatic transmission fluid
and do not overfill.
X J
FLOW RATE (GPM)
1500 RPM
2.4 - 2.8 GPM
LEVEL SHOULD BE