Skyjack SJ3219 Service Manual

98
SJ3215, SJ3219
212508ADA
Hydraulic System Section 4 – Troubleshooting Information
4.3-6 Platform Will Not Lower
1. Defective Lift valve 3H-14. Check valve. Replace if defective.
2. Defective Holding valve 2H-13. Clean valve. Replace if defective.
3. Defective or plugged Lift Orifice O3. Clean Orifice. Replace if defective.
4. Machine overloaded and Overload Lights PL-1
and PL-2 on Emergency Stop buttons flashing
Check machine limits and reduce weight as
required.
Refer to Electrical troubleshooting.
4.3-7 Platform Drives Slow
1. Free-wheeling valve V2 open or defective. Close valve. Replace if defective.
2. Defective or plugged Drive Orifice O4. Clean Orifice. Replace if defective.
3. Defective Counterbalance valve CB1. Check valve. Replace if defective.
4. Drive Motors M1 and/or M2 defective. Check motors. Replace if defective.
4.3-8 Platform Will Not Drive in Forward or Reverse
1. Free-Wheeling valve V2 is open or defective. Close valve. Replace if defective.
2. Brakes are not released. Check brakes. Replace if defective.
3. Forward Drive valve 4H-16 or Reverse Drive valve
4H-15 is defective.
Check valves. Replace if defective.
4. Defective or plugged Drive Orifice O4. Clean Orifice. Replace if defective.
5. Defective Counter Balance valve CB1 Check valve. Replace if defective.
6. Drive Motors M1 and/or M2 defective. Check motors. Replace if defective.
4.3-9 Brake(s) will not Release (Pin Brakes)
1. Brake Release valve 3H-17 is defective. Check valve. Replace if defective.
2. Defective or plugged Brake Orifice O5. Check Orifice. Replace if defective.
3. Leaking or defective Brake Cylinder. Check cylinder. Replace or repair if defective.
4.3-10 Brake(s) will not Release (Wet Brakes)
1. Brake Release valve 3H-17 is defective. Check valve. Replace if defective.
2. Brake Override valve V1 is defective. Check valve. Replace if defective.
3. Defective internal brake piston seals.
Check brake pack will maintain pressure. If
pressure is not maintained replace seals.
4. Defective Brakes BR1 and/or BR2.
Inspect wheel assembly. Repair and replace as
necessary.

Skyjack SJ3219 Specifications

General

Gradeability	25%
Power Source	Electric
Drive Motor	24V DC
Tire Type	Solid, non-marking
Lift Capacity	550 lbs
Machine Width	32 in
Machine Length	70 in
Drive Speed (Stowed)	2 mph
Drive Speed (Raised)	0.8 km/h
Turning Radius (Inside)	0 in (0 m)
Battery	4 x 6V
Working Height	25 ft