7
Figure 4
4.7 Pressure Relief Valve
All pumps contain a factory set relief valve to prevent
over-pressurization. Do not attempt to readjust, disable or
modify this valve.
5.0 MAINTENANCE
5.1 Hydraulic Reservoir
Check oil level regularly. Drain oil and refill with Larzep
hydraulic oil (Part No. AZ8901) every 12 months. If pump
is used in dirty environments, change the oil more often.
Use only genuine Larzep hydraulic oil or a comparable
high quality ISO 32 hydraulic oil having the same technical
characteristics.
The use of any other fluid could damage the seals or
equipment and will make the product warranty null and
void.
5.2 Filling Non-Vented Reservoirs
(all models EXCEPT W26507 and X26507)
Important:
Non-vented reservoirs have a predetermined
oil level that should not be exceeded. Refer to table
Section 2.0 for oil capacities. Never fill a pump beyond
the maximum oil level or capacity recommended by the
manufacturer.
• Non-vented hand pumps always require some air in
the reservoir to function properly.
• A non-vented reservoir should never be completely
filled. If a non-vented reservoir is completely filled,
a vacuum will form, preventing proper operation of
the pump.
5.3 Filling Vented Reservoirs
(models W24507, X24507, W26507 and X26507)
• Vented reservoirs can be filled up to the bottom
of the oil fill hole. However, it is recommended to
leave a small air gap to allow optimum functioning
of the venting system.
• Models W26507 and X26507 must be filled to
within 25 mm of the top plate.
5.4 Adding Oil to the Pump
WARNING
Always add oil with cylinders fully retracted
(extended if pull cylinders) or the system will contain more
oil than the reservoir can hold.
Add oil as described in the following steps:
1. Remove oil fill plug from reservoir.
2. Determine if your pump has a vented or non-vented
reservoir. Refer to Table 2 earlier in this manual.
3. Add oil to the reservoir as required. Refer to oil fill
information in Sections 5.2 and 5.3 (as applicable).
4. Reinstall oil fill plug after adding oil.
5. Remove air from system if necessary, as described in
Section 4.6.
6. Recheck oil level after removing air.
5.5 Keeping Oil Lines Clean
When coupler halves are disconnected, always install
dust caps. Use every precaution to guard unit against the
entrance of dirt, because foreign matter may cause pump,
cylinder, or valve failure.
