HYDRAULIC SYSTEM 14000 SERVICE MANUAL
2-8
Published 09-05-14, Control # 226-02
Servicing Pumps
It is not necessary to drain the hydraulic tank when servicing
the hydraulic pumps. To service the pumps, close the tank
suction shut-off valve (6a, Figure 2-1
).
Open the suction shut-off valve before starting engine
after servicing the pumps.
Hydraulic Connections
• Make sure fittings and O-rings being used are proper
size and style.
• Flush sealing surfaces with clean hydraulic oil to remove
any dirt.
• Carefully inspect threads and sealing surfaces for nicks,
gouges, and other damage. Do not use damaged parts;
they will leak.
• Carefully inspect O-rings for cuts and other damage. Do
not use damaged O-rings: they will leak.
• Always lubricate O-rings when assembling on fittings.
• Be careful not to cut O-rings when assembling them to
fittings. Use thimble as shown in Figure 2-7
when
assembling O-ring over threads.
Pipe Thread Connection
1. Apply sealant (Loctite 92 or equivalent) to male threads,
never to female threads. Do not apply sealant to first two
male threads.
2. Tighten fittings about 4-1/2 turns by hand and then 3
additional turns with a wrench.
Table 2-2
Pipe Thread Leakages
CAUTION
Avoid Damage to Pumps
Open hydraulic tank suction shut-off valve before starting
engine. Failing to perform this step will result in damage to
pumps from cavitation.
O-Ring
Plastic or Metal
Thimble Covering Threads
FIGURE 2-7
S103
CAUTION
Hydraulic System Damage
Do not use PTFE (“teflon”) tape to seal threads. Pieces of
tape will enter hydraulic system and cause damage.
Causes Cures
Fitting loose. Tighten.
Fitting too tight causing thread
distortion.
Replace damaged parts.
Threads on fitting/port wrong size. Use proper size threads.
Threads dirty, galled, or nicked. Clean or replace parts.
Straight thread used instead of
tapered thread.
Use proper type and
size thread.
Threads expanded from heat. Tighten when hot.
Fitting loosened by vibration. Retighten.
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