Got a big boy, 7000 lb, ser# 70068 with intermittent no lift. Customer thought the free lift bearings were seized, but when removing the pullies and chains, the free lift cyl could still not raise. You can hear the pump forcing, and the engine strains, so there is pressure. I did catch the free stick half way, then raise the tellies. It's not seized bearings as you can raise the carriage up easily with another lift when the failure occurs. I'm guessing the internal valve in the free lift is defective. Also, on initial lift with carriage down, the left main cyl just STARTS TO LIFT, then the free lift travels up. Another Toyota tech claims it's in the hyd valve at lift lever. THEY SEND THE VALVES AWAY TO A REBUILDER for repairs. If it was the valve body, how could it affect the free lift cyl from raising to the top? and lift the main tellies up normally?
Showing items 1 - 5 of 5 results.
Was this issue ever solved im having the same exact problems
rev the engine or turn steering and it lowers?
strange symptom
lift and lower section replaced new?
sounds like something was put together wrong to me
Had the valve assembly rebuilt. Needed a new lift valve, all other parts tested ok. INSTALLED valve assembly today. Lift is working each time now, but no lower! IF you rev the engine, or turn the steering wheel, it lowers.. Checked pilot line, has pressure when lowering. Lower valve switch is ok but no power to it. re-builder says his valve repair is ok, i have another issue. Not so sure....
by-passed in tank return hose in case filter was plugged...No go
Model 7FGU35, 2008. At my wits end here!
I swapped the main valve at base of right cylinder with a known good one. Had no lift at all. then suddenly lifted ok. But started to have same failure. Lifts then stops at times if full lift is commanded. It can close completely and block flow but what is giving this valve back pressure to force it closed?
check the safety valve, probably located in the freelift cylinder ram
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