HWH 725 SERIES, Service Manual

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LF RF
RR LR
PUMP PRESSURE RELIEF ADJUSTMENT
INSTRUCTION SHEET
SHUTTLE
VALVE
GAUGE
HERE
ATTACH
PRESSURE
RELIEF VALVE SET SCREW
RELIEF VALVE JAM NUT
ON SOME PUMPS THIS VALVE
MAY BE LOCATED ON THE
REVERSE FACE
MP64.9980
01NOV11
MOTOR TANK
then "Information Bulletins & Instruction Sheets" (Hydraulic Power Unit Information).
6. Clean and check for any leakage at the relief valve. If there is leakage, contact HWH Corporation technical service.
5. Tighten the relief valve jam nut and recheck the pump pressure. Readjust if necessary.
to a maximum of 3600psi. There may be a small amount of leakage at the relief valve while adjusting the pump pressure.
4. While the pump is running, turn the relief valve set screw clockwise until the pressure gauge shows a minimum of 3300psi
www.hwh.com <http://www.hwh.com> . The sheet is located under "Customer Support & Technical Service"
Note: Instruction sheet MI95.74 explains how to run the pump using jumper wires. This sheet is available at
"MANUAL" side of the leveling system touch panel. If the touch panel is used, the ignition must be in the "ACC." position and
3. Use a set of small jumper wires to turn the master relay on and run the pump or have someone push any "UP" arrow on the
1. Remove the U shaped tube from the manifold fitting, NOT the shuttle valve fitting. Fasten a 5000psi pressure gauge
the park brake must be set.
to the manifold fitting.
2. Loosen the jam nut for the pump adjustable relief valve.
IMPORTANT: The pump pressure relief should not be adjusted unless a 5000 psi pressure gauge is attached to the
manifold fitting as shown.