Hello all,
New to this forum and thank you for the opportunity to vent.
Recent acquisition of older Genie Z45/22 dual fuel Onan twin powered manlift. s/n 4588-1662.
Troubles with no drive either direction. Have good voltages at all solenoids with variable voltage to
proportional drive solenoid. All functions above platform turret operate correctly. Replaced four solenoid
valves due to significant internal cage wear. Prop, Fwd,rev and both Hi/Lo drive items plus brake two
position three way valve. Unit shows 4000 hrs on clock. Checked and set or tested all safety reliefs to
stated spec. Main relief set to 3500psi. Steering unit functions and relieves at 750 psi setting at max stroke.
Disassembled and checked hydro pump that feeds drive system. No wear or damage. Ran motor with
hand valve in line with outlet from pump will provide 3000psi before engine fades. Test pressure in manifold
indicates the 750psi when operating but not more then 800 Psi when drive engaged. Have also capped
lines to drive motors with no change to test gauge reading. Motors are two line feed type with brake
release to finial drive torque unit. Brake test pressure is also odd as it goes to 350psi but then
spikes to 1000psi. Hydro in tank inlet strainers clean and no
sludge in hydro tank. Could have been cleaned before me. Little residue in tank. Dextron fluid clean.
Replaced input flow reg valve due to same cage wear. Have really beat on this with limited results. Will
pull manifold next to look for internal leaks cracks. Have been in touch with Genie service tech and he feels
piolet pressure to valves is missing thereby not allowing valves to operate correctly. Any input would be
welcomed. Thanks .
Joe
New to this forum and thank you for the opportunity to vent.
Recent acquisition of older Genie Z45/22 dual fuel Onan twin powered manlift. s/n 4588-1662.
Troubles with no drive either direction. Have good voltages at all solenoids with variable voltage to
proportional drive solenoid. All functions above platform turret operate correctly. Replaced four solenoid
valves due to significant internal cage wear. Prop, Fwd,rev and both Hi/Lo drive items plus brake two
position three way valve. Unit shows 4000 hrs on clock. Checked and set or tested all safety reliefs to
stated spec. Main relief set to 3500psi. Steering unit functions and relieves at 750 psi setting at max stroke.
Disassembled and checked hydro pump that feeds drive system. No wear or damage. Ran motor with
hand valve in line with outlet from pump will provide 3000psi before engine fades. Test pressure in manifold
indicates the 750psi when operating but not more then 800 Psi when drive engaged. Have also capped
lines to drive motors with no change to test gauge reading. Motors are two line feed type with brake
release to finial drive torque unit. Brake test pressure is also odd as it goes to 350psi but then
spikes to 1000psi. Hydro in tank inlet strainers clean and no
sludge in hydro tank. Could have been cleaned before me. Little residue in tank. Dextron fluid clean.
Replaced input flow reg valve due to same cage wear. Have really beat on this with limited results. Will
pull manifold next to look for internal leaks cracks. Have been in touch with Genie service tech and he feels
piolet pressure to valves is missing thereby not allowing valves to operate correctly. Any input would be
welcomed. Thanks .
Joe
Genie Z45/22 manlift drive troubles
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