Service Manual

Multi Pro 5800Page 7 − 38ExcelaRate Spray System
Pressure Relief Valve
The spray system pressure relief valve is a non ad-
justable, non repairable component. When spray sys-
tem pressure exceeds the pressure limit of 218 PSI (15
Bar), the valve opens and spray product is directed to
the suction side of the spray pump. Replace the pres-
sure relief valve if system pressure exceeds the pres-
sure limit (valve not opening), or if desired system
pressure near the pressure limit is not attainable (valve
not closing).
Pressure Relief Valve Testing
IMPORTANT: Make sure to remove and neutralize
chemicals from spray components before testing or
removing the pressure relief valve. Wear protective
clothing, chemical resistant gloves and eye protec-
tion during repair.
To test the operation of the pressure relief valve, follow
the following steps:
A. Have machine on a level surface with engine off
and parking brake engaged.
B. Drain the spray tank and fill the spray tank with
clean water.
C. Close the agitation throttle valve and the boom
section bypass shut−off valve. Make sure that the
traction pedal is in the neutral position and the
sprayer mode switch is set to manual mode opera-
tion.
D. Have a person in the operator seat to control the
spray system and a second person near the pres-
sure relief valve.
E. Have operator start the engine, turn spray pump
switch ON and turn agitation switch ON.
F. While second person listens for pressure relief
valve to open, have the operator slowly increase the
application rate while watching the pressure gauge.
Pressure gauge should open when system pressure
reaches approximately 220 PSI (15 Bar).
Replace the pressure valve if necessary.
NOTE: Replace, do not reuse O−rings. Coat O−rings
with vegetable oil before installation to reduce damage
during assembly.
1. Spray pump 2. Pressure relief valve
Figure 37
2
1
1. Pressure relief assembly
2. Fork (2)
3. O−ring (2)
Figure 38
1
2
3
3