Samson PM35 Guía De Servicio Técnico Y Recambio página 3

OPERATION
This pump is self–priming. To prime it the first time, it is convenient to
connect the air supply to the pump while keeping the outlet gun opened,
and increase the air pressure slowly from 0 to the desired pressure by
using a pressure regulator. Once grease starts flowing through all the
outlets, the pump is primed.
TROUBLESHOOTING
Symptoms
The pump is not working or there is no
grease delivery.
The pump begins to operate very fast.
The pump keeps on operating although
the grease outlet is closed.
Grease leakage through the air outlet
muffler or the leakage warning hole on
the pump body (38).
Air leakage through the air outlet muffler
(54).
Grease output too low or diminishes
over time.
REPAIR AND CLEANING PROCEDURE
WARNING: Before starting any kind of maintenance or repair, disconnect the compressed air supply and open the valve to relieve the grease
!
pressure.
SEPARATE THE AIR MOTOR FROM THE PUMP
1. Fix the pump in a vise in horizontal position (fig. 4). Gently blow with a hammer the upper tube (65) close to the body (38) in order to break the
thread locker.
2. Unscrew the nut (75) and remove the primer (74).
3. Put a bar, rod or any kind of strong tube in the fluid outlet and use it as a lever to unscrew the air motor.
4. Once unscrewed, pull the motor away untill the elastic pin (31) into the rod (30) becomes visible.
With a hammer and a suitable pin punch, eject the pin (31). The motor becomes loose.
74
75
Samson Corporation • One Samson Way • N.C. 28778 Swannanoa • Phone: 00 1 8286868511 • Fax: 00 1 8286868533
Possible Reasons
No suitable air supply pressure.
Some outlet circuit element is clogged or closed.
There is an air pocket in the grease inlet area.
The drum is empty or the grease level is beneath the
suction tube inlet.
There is a grease leakage at some point in the circuit.
Contamination in the upper valve.
Contamination in the foot valve.
Grease has passed over to the air motor caused by
scratched piston rod (30) or worn or damaged seals
(2x34).
Damaged or worn piston O ring (25).
Damaged or worn spool seals.
Contamination in the foot valve.
Contamination in the upper valve.
The exhaust muffler is clogged by compressed air dirt
or lubricant.
The pump starts to pump when an outlet valve is opened, for example a
grease control gun.
NOTE: It is important that the foot valve do not come in contact with dirty
areas, such as a workshop floor, because it may become contaminated with
dirt or other particles that can damage the seals.
Solutions
Increase the air supply pressure.
Clean or open the outlet circuit.
Stir and repack the grease.
Replace the drum or insert the suction tube
until the inlet reaches the grease level.
Verify and tighten or repair.
Disassemble and clean. Replace if damaged.
Disassemble and clean. Replace if damaged.
Verify the piston rod (30) and replace damaged
/ worn parts.
Replace O Ring (25).
Replace seals (4x11), 12 and 14, or replace
instead the full assemled spool (539505) (re-
commended).
Remove and clean. Replace if damaged.
Remove and clean. Replace if damaged.
Replace the muffler felt (40).
65
Fig. 4
31 30 38
R. 07/17 853 827
EN
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