PRATT Industries TRUSS - Complete Loss of Trailer Lights; DIM or Flickering Lights; Cylinder will Not Operate; Cylinder will Not Hold

- 49 -
Complete loss of trailer lights
Probable Cause
Remedy
1. Broken main harness 1. Repair or replace wire
2. Blown fuse or breaker 2. Replace fuse
3. Broken ground lead between tractor and trailer
3. Check, repair or replace jumper cable if
equipped
4. Loose or corroded connection in ground lead
between tractor and trailer
4. Repair or replace
Dim or Flickering Lights
Probable Cause
Remedy
I. Battery on tractor not sufficiently charged I. Charge battery
2. Damaged wire in jumper cable 2. Repair or replace wire
3. Dirty or corroded contact blades 3. Clean contact blades
4. Loose connection 4. Repair as necessary
5. Poor ground at socket 5. Repair as necessary
Cylinder will not operate
Probable Cause
Remedy
1. Insufficient oil level 1. Fill reservoir to proper level
2. Restriction of oil flow 2. Remove restriction
3. Pump is worn 3. Repair or replace pump
4. Hydraulic hose not connected 4. Connect a hose
5. Restricted control linkage 5. Check and repair linkage
6. Broken key or keyway in drive 6. Repair or replace key or keyway
Cylinder will not hold
Probable Cause
Remedy
I. Air in hydraulic system 1. Bleed system by making several cycles
2. Valve control level not in hold position 2. Check and repair linkage
3. Worn control valve 3. Replace or repair valve
4. Worn pump 4. Replace or repair pump
Noisy Pump
Probable Cause Remedy
1. Air in hydraulic system I. Bleed system of air
2. Restriction of oil flow 2. Drain tank and remove restriction
3. Insufficient oil supply 3. Fill reservoir
4. PTO running at excessive RPM 4. Lower PTO RPM's
5. Water in oil 5. Drain system and replace oil
6. Dirty or contaminated oil 6. Drain system and replace oil
7. Use of wrong viscosity or type oil 7. Drain. Replace with recommended oil
8. Worn or damaged pump 8. Replace pump