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OPERATION
DB150 07/11 Operation Section 4-42
© 2011 Alamo Group Inc.
OPERATION
Problem Possible Cause Remedy
Cylinder Rod Came Out
of Cylinder
Piston Nut backed off of
the Rod
Improper retaining of nut, replace or rebuild as
required
Relief Valve setting Too
High
Test relief valve and adjust or replace as
required
Operator abuse Overloading cylinder in the extend position
Deck Cracks
Severe Use or Abuse Excessive ground speed, Overload or impact
with solid objects
Vibration Blades or blade bar bent, or blade missing
Poor or missing welds Manufacturing defect
Deck Worn On
Underside (Cutting
Head Onl
y)
Mowing over sand or rocks Operator abuse
Abusive operation,
mowing heavy debris
Operator abuse
Normal operational wear Normal wear over time can result in cracks or
damage. Check deflectors and guards.
Replace as required.
Hydraulic System Noise
(Squeal)
Restrictions to oil flow in
the system
Identified by concentration of heat, due to Line
restriction bent hoses or contamination.
Relief Valve Malfunction Relief setting too low, will result in generation of
heat, Adjust or replace as needed.
Cavitation induction of air into the system due to leakage
Wrong Oil Used Flush and refill as required
Hydraulic System
Overheating
Excessive Engine RPM Engine RPM should not exceed 540 PTO
speed as indicated on the tractor tachometer
Restriction in Hydraulic
System
Identified by a concentration of heat due to
crimped hydraulic line, relief valve failure or
contamination.
Relief Valve Set too lo
w
Test and adjust or replace as required
Internal Leakage due to
wear
Test pump and motor. Replace or repair as
required
Excessive Pump or Motor
Wear
Test pump and motor. Replace or repair as
required
Wrong Oil Flush and refill as required with proper oil
Abusive Operation (Heavy
Material or debris)
Operator abuse
Motor Flange or Motor
Housing Breaking
Excessive Torque load
due to abuse
Impact with solid objects or excessive loading
of mower due to high ground speed.
Loss of Bolt torque at
flange or at motor section
Due to excessive loading. Check bolts daily,
and replace or repair as required