Cub Cadet U-Channel Beam Style - Manual (Page 20)

2010 Log Splitters
16
Log splitter test procedures
1. Preparation
Troubleshooting and diagnosing a hydraulic system is a process that should be performed in a specific order.
This chapter is laid out in the order the tests should be performed to get the best results.
NOTE: There is a hydraulic system testing work sheet at the end of this chapter. The work sheet is designed to
assist in troubleshooting the hydraulic system. When performing warranty repairs, the work sheet must
be turned in with the failed part(s). Before starting any testing of the log splitter, record the model num-
ber, serial number, pump model number and the valve model number on the worksheet. This informa-
tion will be needed during the testing.
Just because a hydraulic pump is not pumping well does not mean the pump is bad. Before condemning parts or
getting into deeper diagnosis, check the basics.
External factors that will effect pump performance include:
A. Engine coupler: See Figure 3.9.
• Check for a worn spider.
• Check for a sheared or missing key.
• Check for a loose set screw that will allow the
coupler to spin on the crankshaft or the pump
shaft.
B. Leaking fitting: See Figure 3.10.
• Damaged O-ring
• Mis-aligned O-ring
• Missing O-ring
NOTE: The fitting may not be leaking fluid, but suck-
ing in air. This can cause sluggish operation.
NOTE: When tightening hoses with O-ring face fit-
tings, hold the hose so that the center part of
it does not rotate against the O-ring while the
swivel section is tightened. If the center part
rotates, the O-ring can be damaged and it
will leak under pressure.
Figure 3.9
Engine coupler
Figure 3.10
Oil leak
Swivel section
Center section