User guide

6. MAINTENANCE WHEATHEART - POST POUNDER
6.2. REPLACING THE MAST SEAL HIGH & HEAVY HITTER AND HIGH & HEAVY HITTER PLUS
32 IM4 R3
6.1. SETTING RELIEF VALVE
• If unable to raise pounder mast, the relief valve may need to be adjusted.
To do this, loosen the nut using a 1/2” wrench, then using a 
5/32” Allen wrench, turn the set screw clockwise an 1/8 of a turn. Repeat
until mast moves freely.
• If more than 2 complete turns are necessary, install a pressure gauge at
the inlet to the valve to ensure that the pressure is NOT exceeding 2000
psi. See page 37 Section 8.
6.2. REPLACING THE MAST SEAL
6.2.1. HIGH AND HEAVY HITTER
See Figure 6.2.
The seal kit consists of the
following:
• large o-ring (1)
• small o-ring (2)
• buffer (3)
• polypak (4)
• dust seal (5)
Note: Ensure that o-rings are not twisted when placed into the cylinder mast cap.
Twisted o-rings will result in a faulty seal and may cause leaks.
1. Place the large o-ring (1) through the bottom (threaded side) of the mast
cylinder cap (6) into the first groove above the threads.
2. Through the bottom of the mast cylinder cap (6), install the small o-ring (2)
and the buffer (3) into the next recession above the large o-ring (1).
Important: Ensure that the lip on the buffer faces the pressure side (down).
3. Install the polypak (2) into the second groove from the top (wrench side) of
the mast cylinder cap (4). Ensure that the side of the polypak (2) with the o-
ring embedded into it faces the pressure side (down).
4. Insert the dust seal (5) into the top recession with tapered side facing up.
NOTICE
Do not set the relief valve too high as damage to equipment
may result.
Figure 6.2 HH and HH Plus Mast Seal Kit