20195 South Diamond Lake Road, Suite 100 • Rogers, MN 55374
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SERVICE BULLETIN
Toll-Free: 800-621-2789 • Website: maximmfg.com • Email: sales@maximmfg.com
MODEL: PH50B (PLOW HOSS)
BULLETIN #: MPH06292018
KIT CONTENTS:
• 80029 ¼-20x3/4” bolt (3)
• 86115 5/16-18 X 1-1/4 HEX SCREW GR 5-ZINC (1)
• 87373 NUT, CLIP, 1/4-20, 0025-015, BLACK (1)
• MX-500049 Belt Cover (1)
• MX-500073 Welded Belt guide (1)
• MX-500074 Frame spacer (1)
• Engine throttle control decal
REWORK PROCEDURAL STEPS:
1. Remove the three fasteners which secure the belt guard. The belt guard
and the mounting bolts will not be reused.
2. Engine Adjustments:
2.1. Loosen the four engine mounting bolts located under the engine.
2.2. Use a ruler to measure and adjust the engine to achieve a distance of
1-5/8” from the front of the engine mounting bracket and the engine
case see Image 1.
2.3. Use a framing square (if available) to ensure the engine case is
perpendicular to the tiller chassis see image 2. Once aligned tighten
the four engine mounting bolts.
Document: MX-500076 Model: PH50B Rev. A Date: 7/5/18 Page: 1
20195 South Diamond Lake Road, Suite 100 • Rogers, MN 55374
Image 3
STEP:
STEP:
4.1
Image 5
STEP:
4.2
Image 4
STEP:
Toll-Free: 800-621-2789 • Website: maximmfg.com • Email: sales@maximmfg.com
3. Belt guide update:
3.1. Locate the mounting fasteners of the belt guide (Image 3). Please note that both fasteners have an
additional standoff washer located between the bracket and the engine gear reduction.
3.2. Remove the two bolts retaining the belt guide as well as the push on nut which retains the belt cover.
The bolts and washer will be reused in next step.
3.3. Install the new belt guide supplied in the kit using the same fasteners as last step (Image 4). Be sure to
install the spacer in the same location as it was removed. Torque fasteners to 140 in/lbs. Install push on
nut which retains the cover to the bracket.
3.1 and 3.2
4. Tensioner arm rework:
4.1. Disconnect the clutch cable from the tensioner arm (Image 5).
4.2. Please note that there are several washers used in the mounting of the belt tensioner arm (Image 5).
Remove the single fastener which retains the belt tensioner. This hardware will be reused.
Document: MX-500076 Model: PH50B Rev. A Date: 7/5/18 Page: 2
20195 South Diamond Lake Road, Suite 100 • Rogers, MN 55374
Image 8
STEP:
5.1
STEP:
4.5
Image 7
Image 6
STEP:
4.3
Toll-Free: 800-621-2789 • Website: maximmfg.com • Email: sales@maximmfg.com
4.3. Remove the single fastener retaining the pulley from the tensioner arm (Image 6).
4.4. Move the pulley to the opposite side of the tensioner arm and mount it in the hole which prior mounted
the arm to the chassis (Image 7). (spring holes closer to pulley & towards top shown in image 7).
4.5. Move the tensioner spring to the hole located nearest the new pulley location (Image 7).
4.6. Reinstall the tensioner arm using the same mounting hardware and assemble similar to Image 5 and
tighten fastener. Reconnect the clutch cable to the tension spring.
4.4
5. Rear Belt guard mount:
5.1. Remove the rear belt guard mounting bracket and discard the bolt
(Image 8).
Document: MX-500076 Model: PH50B Rev. A Date: 7/5/18 Page: 3
20195 South Diamond Lake Road, Suite 100 • Rogers, MN 55374
STEP:
5.2
Image 9
STEP:
6.1
Image 10
STEP:
6.2
Image 11
Toll-Free: 800-621-2789 • Website: maximmfg.com • Email: sales@maximmfg.com
5.2. Install the supplied square shaped spacer/washer between the belt guard mount and the frame.
Reattach the belt guard mount bracket using the longer bolt supplied in the kit and reuse the nut.
Tighten fastener. (Image 9)
6. Jackshaft pillow block bearing adjustment:
6.1. Loosen the four bolts retaining the pillow block bearings
and shaft (Image 10).
6.2. Adjust both pillow blocks to 7/8” from the back edge of
the bearing mount surface to the casting (Image 11).
Tighten all four fasteners.
6.3. Please note that the center to center distance between
the engine output shaft and the driven pulley axle
should measure approximately 20-7/8” to 21”.
Document: MX-500076 Model: PH50B Rev. A Date: 7/5/18 Page: 4
20195 South Diamond Lake Road, Suite 100 • Rogers, MN 55374
Image 12
Toll-Free: 800-621-2789 • Website: maximmfg.com • Email: sales@maximmfg.com
7. TESTING OF UNIT:
7.1. Ensure the engine kill switch is set to the off position and the unit is securely sitting on the kickstand.
Disconnect the clutch cable from the clutch engagement lever.
7.2. Pull the engine starter rope and observe if the driven tire rotates.
a) If the driven tire does not rotate go to step 8 below.
b) If the driven tire does turn repeat section 6 above but adjust the bearing blocks to 15/16” in step 6.2.
If the drive wheel still turns repeat this procedure and increase bearing block spacing by an additional
1/16 inch until Testing is successful.
8. Clutch cable reattachment and operation testing:
8.1. Reattach the first chain link after the cable of the clutch cable assembly to the s-hook of the clutch
engagement lever. Secure the S-hook to the end of the first chain link after the cable.
8.2. Ensure the engine kill switch is set to the off position and the unit is securely sitting on the kickstand.
8.3. Pull the engine starter rope and observe if the driven tire rotates.
a) If the driven tire does not rotate go to step 9 below.
b) If the driven tire does rotate then disconnect the clutch engagement cable assembly from the S-hook
and relax the cable by ½ link and reattach the cable assembly to the S-hook. Repeat 8.2.
9. Install MX-500049 Belt Cover using the ¼-20x3/4” screws supplied in the kit.
10. Install Throttle control decal over the top of the existing one (image 12).
10.1. Align label and peel backing off bottom and install label over incorrect label.
10.2. Note to operators and owners that the on-off switch is on the engine.
If you have any questions or need assistance,
please call Maxim technical Support at:
800-297-4918
Document: MX-500076 Model: PH50B Rev. A Date: 7/5/18 Page: 5
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