7. HYDRAULIC SYSTEM
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7.2 MAINTENANCE
7.2.1 MAINTENANCE OF PUMP
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Cautions
1. Before disassembling the pump, check for oil leaks from the oil seal, the mating section of the
pump body and cover, and other areas.
2. Remove rust, dust and dirt at the shaft end and the pump body. Failure to do so might damage
the parts or allow them to enter the inside of the pump during disassembly, thus misleading your
diagnosis about the pump.
3. The pump has some symmetrical parts. Before disassembling the pump, mark the parts in the
manner shown in the “disassembly procedure”, to ensure correct reassembly. For this purpose,
use oil paint not to damage the parts.
4. Disassembly is a means of finding out the cause of a trouble. Observe the procedure for
disassembling the pump.
5. Before disassembly, make sure you get new packings, gaskets, and oil seals.
Fig. 7.17
Fig. 7.18
(1) Disassembly
①
Hold the front cover in a vice with the input
shaft side downward.
Notes: 1. The bolts will be loosened during
disassembly. Make sure to hold the front
cover in a vice securely as shown in
Figure 7.18, to prevent the pump from the
vice when a force is applied on the pump.
2. Mark the rear and front covers and the drive
gear side of the pump body with oil paint.
②
Turn the four tting bolts with a torque wrench
in the tightening direction, to check whether they
are properly tightened to 88 - 98 N-m {9 - 10
kgf-m} [65.1 - 72.3 ft-lbs].
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