System will not operate in either direction
System will not operate in either direction
Item Description Action
Oil level in reservoir. Insufficient hydraulic fluid to supply system
loop.
Fill reservoir to proper level.
System pressure Low system pressure does not provide
enough power to move load.
Measure system pressure. Continue to next
step.
High pressure relief
valve
Defective high pressure relief valve cause
system pressure to be low.
Repair or replace high pressure relief valve.
System noise or vibration
System noise or vibration
Item Description Action
Reservoir oil level Low oil level leads to cavitation. Fill reservoir.
Aeration of the oil Air in system decreases efficiency of units.
Excessive noise, foaming oil, and hot oil all
indicate air in system.
Find location where air is entering into the
system and repair. Check that inlet line is not
restricted and is proper size.
Cold oil If oil is cold, it may be too viscous for proper
function causing pump cavitation.
Allow the oil to warm up to its normal
operating temperature with engine at idle
speed.
Shaft couplings A loose shaft coupling will cause excessive
noise.
Replace loose shaft coupling.
Shaft aligN•ment Misaligned shafts create noise. Align shafts.
Sluggish system response
Sluggish system response
Item Description Action
Oil level in reservoir Low oil level causes sluggish response. Fill reservoir.
High pressure relief
valves settings
Incorrect pressure settings affects system
reaction time.
Adjust or replace high pressure relief valves.
Low prime mover
speed
Low engine speed reduces system
performance.
Adjust engine speed.
Air in system Air in system produces sluggish system
response.
Fill tank to proper level. Cycle system slowly
for several minutes to remove air from
system.
Transmission operates normally in one direction only
Transmission operates normally in one direction only
Item Description Action
Exchange high
pressure relief valves
Exchanging the high pressure relief valves
will show if the problem is related to the
valve function.
If the problem changes direction, replace the
valve that does not operate correctly.
Service Manual TMM Transit Mixer Axial Piston Motor, Size 070/084/089
Troubleshooting
20 L1211037 • Rev AC • Apr 2014
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