User's Manual

18 309024
Troubleshooting
Troubleshooting Techniques
Because the pumps are mechanically linked, the action
of one pump can affect the readings of the second
pump. Therefore, the key to successful troubleshooting
is to be sure to isolate the problem.
For example, the secondary pump pressure, as read
on the gauge, is low and sluggish during pump
changeover. The most likely problem is a binding
primary pump.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 15.
To isolate the pump:
1. Relieve the pressure.
2. Disconnect the index clamp (30) from the
secondary pump and lean the pump out of the way
of the lever arm (49). Now you can verify the
operation of the primary pump alone.
3. Use the sampling valves (119) at the mixer
manifold (120).
a. Check the outlet ratio for the primary side.
b. With the sampling valves closed, check for
pump stalling on both the up and down
strokes.
c. Check for rapid gauge response during pump
changeover.
4. When the operation of the primary side has been
verified, reconnect the lever arm (49) to the
secondary pump. Let the primary pump run freely
in a pail of fluid and repeat the checks in Step 3 on
the secondary side.
WARNING
Use very low air pressure to the air motor when
making these checks. This system can produce
very high fluid pressure, which can cause serious
injury, including injection, splashing in the eyes or
on the skin, and injury from moving parts. Follow
the Pressure Relief Procedure on page 15.
WARNING
To reduce the risk of injuring or amputating a hand,
fingers or other body parts, never place your hands
or any part of your body or any tools inside the
safety panel at any time, for any reason, while the
unit is operating.
Refer to the manuals listed below to repair
the VRHC components.
Component Ref. No. Manual No.
President Motor 207352 306982
Bulldog Motor 20835 307049
Monark Motor 205997 307043
Viscount I
Hydraulic Motor
948699
307654
Pump Lower 215932 307430
Pump Lower 215930 307431
Pump Lower 217339 307430
Pump Lower 222012 307944
Pump Lower 239388 307944
Pump Lower 222015 307944
Pump Lower 222017 307944
Pump Lower 222019 307944
Pump Lower 217529 306936
Pump Lower 901878 307862
Pump Lower 948640 684004
Pump Lower 948641 684004
Pump Lower 948195 307944
Pump Lower 948197 307944