918215/CP0407 68 Printed in U.S.A
TROUBLESHOOTING 1448 PLUS
DRIVE AND MAIN CONTROL VALVES
Transverse cracking
(checking)
See Causes 1-4, 6
Mat shoving under roller See Causes 1-4, 6, 9, 13
Bleeding or fat spots in mat See Causes 3, 4, 6, 13
Roller marks See Causes 1, 2, 6, 9, 10
Poor mix compaction See Causes 1-4, 6, 9, 10, 12, 13
Problem Possible Cause Corrective Action
Incapable of maintaining the
load
Internal oil leak at the spool Replace entire valve housing and spool
Oil leaking at relief valve port Disassemble and clean or replace relief
valve
Load check poppet or seat damaged
(located inside sections)
Replace poppet and seat assembly
Spool sticking or does not
move
Hydraulic oil contaminated Drain oil, replace with fresh oil
Replace filters
Valve clogged with dirt Remove dirt and clean assembly
Inside of plunger cap filled with oil Replace seal on end of cap
Restriction at spool internal stop Remove restriction
Replace entire valve section and spool
assembly
Pressure too high Adjust pressure
Lever or link bent Remove and replace lever or link
Spool bent Replace entire valve assembly
Return spring failing Replace spring
Return spring or cap misaligned Loosen, align and tighten spring or cap
System oil temperature distribution not
uniform
Allow sufficient warm-up for entire
system
Oil leaking at seals Paint sticking at seal Remove and clean the seal
Back-pressure in valve Replace hydraulic oil filter
Dirt in seal Remove and clean the seal
Seal plate has loosened Replace valve housing as assembly
Seal broken or damaged Remove and replace seal
Controls feel heavy Foreign matter in control valve spool Clean control valve
Valve spool sticking Replace entire valve housing
Control linkage lacking lubrication Properly lubricate linkage
Problem Possible Cause Corrective Action
Courtesy of Machine.Market
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