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6
Troubleshooting SLT-660F/1650 Scissor Lifts
The numbers in parentheses refer to the appropriate breakdown, 660F listed first/1650 listed second.
Trouble Probable Cause Remedy
Table will not lift.
Oil level low in reservoir. Replenish reservoir.
Lowering valve (28/29) or steel ball
(25/26) is not seating.
Clean lowering valve (28/29) or steel
ball (25/26) or replace.
Steel ball (13/14) is not seating. Clean or replace steel ball (13/14).
Relief valve is not adjusted properly.
Reload truck within load capacity and
adjust valve by pressure relief adjusting
screw (54/52).
Table will not remain
elevated.
Lowering valve (28/29) or steel ball
(25/26) not seating properly.
Clean or replace lowering valve (28/29)
or steel ball (25/26).
Oil seal (6) or U-packing (7) is worn out. Replace oil seal (6) or U-packing (7).
Table will not lower.
U-packing (7) is worn out. Replace U-packing(7).
Lowering valve plug (28/29) is clogged. Replace lowering valve plug (28/29).
Oil leaks from lowering
valve.
O-ring (27/28) is worn out. Replace o-ring (27/28).
Oil leaks from pump
cylinder.
Oil seal (38/39) or U-packing (39/40)
worn out.
Replace oil seal (38/39) or U-packing
(39/40).
Replacement Parts
Replacement parts are listed on the following pages. To order parts or reach our service department, call 1-
800-274-6848 Monday through Friday, 8:00 a.m. to 5:00 p.m. CST. Having the Model Number and Serial
Number of your machine available when you call will allow us to serve you quickly and accurately.
Non-proprietary parts, such as fasteners, can be found at local hardware stores, or may be ordered from JET.
Some parts are shown for reference only, and may not be available individually.
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